Hi, my period was 4 days late this month, two negative tests, then I only bled for 2 and a half days. It wasn't light, but it wasn't heavy either. Haven't had cramps or anything. Boobs are insanely sore though...am I pregnant?

We can't diagnose pregnancy online, it can only be diagnosed with a urine test, blood test, or an ultrasound in later pregnancy.

Testing at 4 days late is too early. You shouldn't test until your period is at least 2 weeks late, then test with first morning urine.

The bleeding you had could just be an off period, which would mean you're not pregnant. I'd wait until your next period, see what happens. If you miss it, test using first morning urine. If you don't miss it, you know you're not pregnant.