I already have 1 kid and my man has kids we've been trying to get me pregnant months and I'm still not pg

Have you tried the obulation test? Are your periods normal?

That is very little to go on. Have you tried using an ovulation kit? Are you taking your temp and writing it down? Are you allowing enough time between coitus for his sperm count to rise again? Is he wearing the right underwear to allow his scrotum to not get to warm, which can cause a low sperm count? Is your menstrual cycle normal? If you have been on the pill for some time, how long have you been off it? Those are the most basic questions to ask first. If you can not find your answer among these (You might want to read up a bit on just these few topics) you should consult with a Dr.