I’m extremely curious to know if I can possibly be more fertile right after or right before my period…

I remember my last two pregnancies have either been because of sex right before my period and my second right after my period. But when I try to get pregnant during my “fertile days or ovulation” I never get pregnant…

OR the two times I’ve gotten pregnant is when I take prenatal vitamins 2 months prior trying to conceive. So now that I haven’t took any, I haven’t had luck getting pregnant.

I’m also breastfeeding my almost 2 year old and wondering if that’s something that prevents?

And is caffeine intake an issue too?