Bfp or trigger?

The math doesn’t add up in my head so I need help! We took the trigger shot at 10pm last Thursday. According to FF and Glow, I ovulated Saturday which I think is pretty accurate because I feel lower abdomen pressure leading up to ovulation and the pressure stopped around Saturday afternoon. I’ve been testing out my trigger shot and it stopped showing up on my 25miu test strips two days ago. This morning I got a vvvvvfl on one of them, the line reader on fertility friend even picked up on it! So my question before I get too excited is, is it possible that it’s still the trigger even though I got two whole days of negative tests using the same test? My 2nd wondering is how can my body already have enough HCG to be picked up on a 25miu test at 8dpo? I’m 10 days past my trigger so...thoughts???