Blood clot during pregnancy?!?!

Okay, so I just want to know how logical this is. It sounds very logical in my head, but I just want some input.

January 14 - unprotected sex

Feb 1 - Late period so I took a test and I swear I saw a very very faint positive. Like almost ghostly. I figured it was wishful thinking and just decided to go on about my life and just let my period come when it would.

Feb 4 - I get my period, full on. Not too light, not too heavy. Definitely big clots here and there on the first few days. I remember one looking very big and I was shocked. Period lasted a week.

Feb 18 - I see brown discharge. I want to not be afraid and just want to be 100% sure I’m not pregnant and in the middle of a miscarriage so I take a test. Two tests just to be safe. BFP! Strong too, unlike the one I had when I was having a miscarriage.

Feb 19 - I head to urgent care and tell them about the pregnancy. They test urine and blood (but I’m still waiting for results on HCG levels)

While I wait, I’m trying to figure out if that big clot during my period could have been the baby passing.

So here’s the logic part. If I tested just days before I had a period and the result was extremely faint... and I pass the baby just a few days later... I wouldn’t be having a strong positive now, right? I mean, that was about 2 weeks ago almost. It should be faint! Right? Chances are the giant blood clot was just that -a giant blood clot- right? Not tissue from miscarriage? 🤷🏽‍♀️

I’m not stressing, I’m just asking. I’ll have to wait for actual results til next week... but I’m just wondering.