If this is my 3rd miscarriage in my engagement, is it likely I'm infertile?

Anonymous
I had miscarried in two other past relationships long ago too but didn't think too much back then (after all I was just 19 and 21 years old at the time). It was either that or I just simply didn't get pregnant. Now that I'm engaged, it keeps happening and I'm 29... this worries me.

We've been engaged for 8 months now and this is my 3rd miscarriage with him. I've already set up my appointment with the gyn for Thursday morning. I'm nervous though. Hopefully it's not something bad. Is it likely me with the issues and that I'm infertile?
Updates:
1 mo
Note: Those 2 past bfs whom I had a miscarriage with are already with someone else and have kids. They were able to get other women pregnant.
If this is my 3rd miscarriage in my engagement, is it likely I'm infertile?
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