Period or pregnancy discharge?

Since my last period, I have had sex 4 times. For 2 of the times we used a condom and the other 2 he pulled out. I am on the pill, and haven’t missed one since starting it like 4 months ago. At most I have probably been an hour and a half to 2 hours late. Anyways, my period is supposed to start today, and I have not gotten any of my normal symptoms. I was wondering if this is period discharge, or if it even means anything. I did have sex last night (included in the 4), but I think anything left over from that would be gone by now. Pictures attached, and any advice is appreciated!!

Also, how likely is it for me to get pregnant while being on the pill and him pulling out?

This is my first time wiping

This is my second time wiping

Thank you again!