Just had my second miscarriage and I’m a wreck

Me and my husband have been lucky to get pregnant so fast both times and I’m only 27, so I never thought this would be an issue. My first one was earlier this summer at 7 weeks and now I’m experiencing a very early one, so I guess a chemical pregnancy? I wish I never even tested because I could have easily not even know I was pregnant. In case anyone asks I know I wasn’t still testing positive from my previous miscarriage because my hCG had gone back to below one. The odds seemed so small for my age and it feels like everyone I know is pregnant. One of my best friends got pregnant exactly when I did the first time and we basically had the same due dates. Now I don’t even want to be around her because it will just make me sad. When should we do more extensive testing? I have thyroid issues but that has been closely monitored. My BMI is only like 18.5 so would gaining weight help at all? I know I shouldn’t blame myself but I feel like something is wrong with me, like I’m not a real woman if I can’t carry a baby for more than a few weeks. I know that sounds harsh and I would never think that about anyone else for miscarrying, but I can’t help but think it about myself