Has this happened to anyone else?

Brianna

So I am a mother of 3 boys, ages 5, 3, and 1. I had no problem getting pregnant with any of them. I actually did not intentionally try for any of them, they just kind of happened. I have been with their dad since I was 17, I’m now 25. Currently, (for the past 3 months), we have been actively trying for a baby (hopefully a girl). This is to be our last and final child, as all of our kids will be two years apart, and we do not want to have anymore kids past the age of 30. We want them all to be in school and slightly self-sufficient by the time we are 30. We have had had sex every single day for like almost 100 days, and he has ejaculated in me at least 3, but on average of like 5 times each day, and my period has continued to come. I have been spotting off and on in between periods each month, which is abnormal. I have always had my periods like clockwork, and no intermittent bleeding, ever. Could I be infertile, even after having had 3 kids without complication? Has anyone else experienced this? What could’ve happened? Granted I know it’s only been 3 months, but with the other pregnancies, it was just a matter of one slip up on my ovulation days, and each time I knew right away I would be pregnant, and I was. I’m just so confused and wondering what I can do.