Im beginning to think i just wont have anymore kids

So I'm on ten months of trying for baby #2 and I guess u can say my rainbow baby. I got pregnant in 2010 and had a beautiful baby boy. Shortly after that I fell pregnant again. I mean my son was only four months and I had a miscarriage at six weeks. So you do the math. Neither of these pregnancies were planned. And now it seems as if it will never happen again for me. I really want this baby so bad. But if it doesn't happen before my son is at the ten year mark. I'm just gonna stop trying altogether. I don't understand. My doctor says I'm healthy and nothing should stop me from conceiving. My S.O is also healthy. Doctor told him he shouldn't have a problem either. I pray this is my month. My TWW starts tomorrow. Anyways thanks for listening to me rant.