Please help me!!!!!!

Hi, Hope whoever is reading is doing well

I need help. I am a 20 year old who has taken plan b three times this year ( I know stupid and there’s birth control) but I got naive and careless because I thought I was in love. The first two times I’ve took it my cycle did become irregular but I still managed to get my period. This time (3rd) time I reacted differently I got what I think is my period 5 days (28jul-1aug)after taking it and had brown/dark red spotting or light period since the period ended (2 aug-10 aug) then got another period (11 aug- 15aug) I’ve taken 10 pregnancy tests and all came back negative Is there a chance I could be pregnant or the plan b was successful

Please help me