My mother was 40 & my father was 42. My next oldest sibling is 7 years older. I am fairly sure I was unexpected back in the early 60’s…
My mother is a virgin, and my brother and I were miracles from God. And I won’t hear different.
My mom told me I was conceived in New Orleans on the 4th of July, on purpose.
I was born a little over a month premature, born on Feb. 25.
First time on my parents’ new matress. All I know or care to know.
I’m a ‘foam’ baby. My parents had been married for two years and they were thinking of starting a family. According to my mom, she went off the pill, but wasn’t quite ready to conceive, for some reason, so they were using the contraceptive foam, but the egg and sperm, they were hearty, tough, persistant, unstoppable! Thus was I born.
All I know is my parents were married, had 2 daughters and were very poor. My mother has mentioned holding me and thinking it was the happiest time in her life.
I was shot out of a cannon. It was a pink cannon. I stayed in the bellows of this cannon for…oh…roughly 9 months. I was shot out after this period of time.
I obviously need to go to bed.
Nothing, aside from a rough idea of when it must’ve happened, and I’d like to keep it that way. I know I have one friend who knows more about her conception than she might’ve liked.
I was conceived in the back seat of a 67 VW Bug at a Drive-in showing Barberella.
My mother was 29 when I was conceived. In 1946, that was quite old to be bearing children.
She had given a son up for adoption several years before. Later, she married, had a second son, who died, probably of SIDS, although, she was convinced the baby’s father had left a door open, and given him pneumonia. They divorced, he left town. Eleven moths later I was conceived. I don’t know who. I asked once, she got very upset. I don’t think she knew. The fleet was in, I was told by my evil grandmother.
When I was eight days old, she left me with her parents, to go look for a job. She didn’t come back for four years.
Heh. My parents were virgins. At least, my mom has said she was a virgin when they got engaged… 
No clue whatsoever about my conception.
My kids? Yeah, I know, exactly. The older son- hubby was working as a DA in a neighboring county, so he had a little apartment for during the week, then came home on the weekends. One week, I was ovulating so I went to meet him for “lunch.” He protested, saying he had a meeting in a judge’s chambers that day. I said something along the lines of “Tell him you can’t make it because you wife is ovulating!!!” Baby ensued.
The younger son was concieved in Sun Valley, Idaho, during a long weekend trip.
Both times, it was my first egg drop off the pill, and BAM!
There have been several posts about “short gestational periods” in first kids. My MIL’s aunt always said that the first pregnancy could be any length. Only subsequent pregnancies had to last 9 months! 
I was planned. This is the amazing amount of information I know about my conception, and I’m not particularly interested in knowing more.
Besides, I can guess. At home, missionary with the lights off.
My lesbian cousin was born 9 months before me. She once told me teasingly that when she was born my uncle threw a big party to celebrate, my parents were there and got so drunk and happy they went home and conceived me. I’m pretty sure she just made that up, rather than reporting hearsay…
I was a rhythm baby, the 4th child of 2 RCs.
After me, my mom said screw that shit, and started using contraception - which I guess she considered a sin as she never received communion.
I was conceived in my father’s house, a short distance from where I’m typing this, back in October '62. I’m a bastard and proud of it (my parents never married, and it was all just a between-marriages fling for my father). Mum says it was a cool October night, there was a rug, a fire, and he forgot the condom.
I like it. I have a origin story. 
I was sort of a mistake, only because my parents were planning on having me a year later. I was conceived in Germany, my parents were in the Air Force…9 months later I was born on an AF base in North Dakota. Not terribly exciting.
I was, in my parents’ own words, “a terrible mistake.” My mom and dad were married six weeks before my birth. When I was a child, they often had screaming matches in which they reminded each other that they would never have gotten married if not for me, the “terrible mistake.” I doubt that they stopped to consider that this wasn’t the best sort of thing for me to hear.
Uhhh…for natural planning, aren’t you supposed to be counting backwards from your next period? (I assume you will be counting forward if you mention last day of period)
I was adopted so don’t know any details other than I was the result of some “young foolishness” and kept a secret from everybody - I have since met my birth mother, but she claims not to know my father.
My adoptive mother was also forced to give a baby daughter when she was young, also the result of young foolishness. Interestingly enough, she was “sent to stay” with my adoptive father’s older brother during her pregnancy (common in those days) to hide the baby - he wanted to keep it, but her parents wouldn’t allow.
Our own daughter we suspect was conceived in a friend’s guest bedroom around the Chinese Lunar New Year during a holiday. She was “sort of” unplanned - we weren’t planning on children just yet, but weren’t bothering with birth control either. She was very much watned though!! My wife got pregnant a second time, this one unplanned when our daughter was One year oled - I very much wanted, my wife unsure. We lost the baby and are now trying very hard for our second! I get the orders - copme to bed NOW - I watn your sperm!!!
Well, you can’t really count backwards from your next period, because you don’t know when it’s going to start – it would be like calculating your age today based on your date of death.
For NFP, the first day of your cycle is the first day of your period. The traditional story is that ovulation occurs around day 14, but that is the average of many women; some women ovulate around day 20 and some around day 7, or any day in between. This is why the old “rhythm method” is notoriously unreliable. And starting to count on the last day of your period could make your count off by as much as a week, if you could even tell when the actual last day was (for a lot of women, it’s a gradual ending)!
You can find a lot more info here, and there have been a number of threads on the subject around here.
Good luck with that second baby!
Oh, and I know nothing about my own conception, and I prefer it that way. In some cases, ignorance is bliss.