I'm going crazy

me and me SO have been together for 7+ years now, ttc for the past 4 months, I know it's not long, but I had a miscarriage a couple of years ago and not I'm scared that 1 I can't have kids now, and 2 if I do become pregnant that I won't be able to carry to term. all I can think about it having kids of my own. it doesn't help that both of my very close friends are very pregnant.... I make them let me go to all their appointments because I don't know if I will ever get to experience gettin to see an ultrasound. I feel like I am going crazy....