Pregnancy

Hey girls I’m new here, I’ve already got 2 kids and I’m trying to get pregnant for my 3rd but I’ve got a low chance of getting pregnant again as I was so ill with my 2nd.

With my 1st I found out at 18 weeks, with my 2nd I found out at 6 weeks I had to take tablets to help me get pregnant. Im hoping to get pregnant soon, but I don’t know if I could be already pregnant and it’s too early to show (3 neg tests) or if I’m gunna struggle with getting pregnant again... any ideas on what I can do?

Thanks