Mr. Kiminy and I move into an apartment together a couple of years before we actually got married. I was not a virgin before then, and we certainly shared a bed before we got married. I was also SO regular in my periods that I could predict the start of my next period within hours, even before I started taking the Pill.
We actually timed the marriage so that there would not be any chance that my period would start during our two-week honeymoon, based on the fact that I had been regular to the day for the previous ten years or so.
When we got married, I think my psyche finally decided that sex was acceptable. We had the best sex possible (or so I thought) our wedding night, and three days later, my period started. I was still on the pill, and we definitely had no plans to conceive, but I think my hormones got a little whacked by the emotions involved, and the sexual stimulation sped up the ovulation/menstrual cycle. This was absolutely the first and only time that my period had ever been significantly early.
However, the best sex we ever had was when we finally decided to conceive a baby. I had been off the Pill for a couple of months already, but given my “heightened” stimulation, I would not have been at all surprised if I had had a period a few days later, even though the “event” was timed two weeks before my next period was due to start. As it was, I got pregnant on our first real attempt.
I do believe that the menstrual cycle can be disrupted by extreme sexual stimulation, so it’s possible that your wife’s body just reacted in an unusual way to the stress/relief/enjoyment. Next month, you may want to take things a little more casually and see what happens.
This may be TMI, but one act in the missionary position produced a girl for us, and one act in doggy-style produced a boy. Both were definitely timed, based on my extremely regular cycles, rather than thermometers or ovulation tests (which didn’t exist OTC back then, anyway). The first was a “let’s see if it works” thing, because we knew we wanted children, and we figured we were as ready as we ever would be. The second child was more of a “we have a girl, let’s see if we can get a boy” attempt.