BFP but incredibly stressed

Got a BFP at 10dpo after a round of letrozole. I wasn’t expecting it to be positive; took a cheap strip test, ran to the gas station, forgot about it for a while. Finally remembered to check it and started sobbing when I saw that it was positive. Not happy tears, but panicky, awful ones. I thought I’d be happy but after 3 consecutive losses I just immediately assumed the worst—that I’d lose this one too.

So I took another test. And another. And now I’m 13dpo and stressing about my lines not getting dark enough quickly enough. I feel like I’m losing my mind.

I know that there isn’t anything I can do if I’m going to lose this one too. I know that line progression isn’t necessarily a huge deal. But I can’t stop the compulsion to keep taking tests.

Can anyone talk me down? (Tests are 10dpo, 12dpo, & 13dpo from top to bottom).