Ok so I've been ttc for about 3 months now and nothing. My cycles are 28 days and lasting 4. My last period was 7/6 and my fertile window was tje 15-20th in which i had sex almost everyday un protected. I notice a slime clear like jelly discharge about 3 days ago and yesterday i expected AF. She comes like clock work but this day NOTHING. My boyfriend and i had sex later that night and today i am lightly bleeding. Not light enough to be spotting but not heavy enough for AF. I have lower back pain off and on which os odd for af for me. As well a occasional one sided pain. 6 and 10 dpo took tests which were negative and haven't done anymore. Could i still be pregnant or what should i do