2 days late TTC

Last period was January 11 2021 since November my period been 25 day cycle I have been trying to conceive...im lost on wen I could be ovulating or fertile, took a test today it came back negative I was supposed to come on feb 5 2021 never showed I also started a lil bleeding don’t know if it’s my period or not tryna start any opinions I have real bad back pain and sore boobs and gas sorry tmi