CD 35 no AF, no BFP

Christie
Hi, just wondering if someone can help shed some light. I've been off the pill for a few months now, first few cycles were normal (28 days, AF came on time lasted as usual) last cycle AF last two days longer (and heavier) stopped for four days, then I had four days of pink/red spotting (cd 12-15) then nothing. I'm currently cd 35, all tests negative, still no AF. Just some pink spotting yesterday morning after sex then some more red spotting this morning then it completely stops. Just confused