Just realised I may have miscarried years ago

I'm TTC with my husband. We are now on month 8. We've been together forever. Please no judgement, but we had an abortion many years ago when we were still teenagers. We were young and stupid and our parents had never explained anything to us.

Now that I'm older I'm doing my research because I'm trying to determine whether the abortion (although done at a highly reputable clinic) may have messed things up. I have seen a gynae yearly who doesn't seem to see any problems with me, but still. I've not seen her since we've been TTC, saw her just before.

Anyway, I was doing my research because last month I had a weird period and I think it may have been a very early miscarriage (it was brown and had quite a bit of tissue, not like my normal periods). I was Google pictures and I stumbled across a picture that gave me such a flashback.

Before the abortion, I remember I once had what I thought was one of my eggs pass during my period (again, my mother didn't explain anything to me). I even remember telling my husband (then boyfriend) about it. It was about the size of my pinky nail and hard.

Looking at the miscarriage pictures, one of them looked exactly like that and I just realised I may have had a miscarriage then too, but just didn't realise it (I was 16, again young and stupid).

I'm kind of heartbroken at this, because to me it means that maybe I won't be able to get pregnant again (I am in my 30s now, and it has been months).

Am I possibly just overthinking?