I would say obviously not given that literally billions of couples have had frequent sex without contraception over many thousands of years and 19 births is at the very high end of the distribution for anyone. It is hard to pull it off mathematically or biologically. To have 19 live-born children, a woman would need to stay pregnant almost constantly from the teenage years until fertility drops off precipitously in her mid to late 30’s. That isn’t easy to do even with daily sex without contraception. There will probably be a few miscarriages than need to be offset by twins or triplets for it to work at all.
It is difficult and takes some luck to break even the very low double digits even without contraception. Most women can’t get pregnant on demand especially in their 30’s. It can take many months to years to conceive even if it is intentional. Having that many children in succession tends to wreck their body in lots of ways and stands a very good chance of being fatal to the mothers or some of the children without very good medical care.