IN SERIOUS NEED OF ADVICE Late Period, first month on the pill...

Usually I would have started my period on the 17th this month but I started the pill. I took my second pill of the final week ( the ones you have your period on) and I’m cramping and having most my symptoms but I’m not bleeding... my boyfriend and I have had unprotected sex (about four days ago and the instructions said 7 days and I could have sex so I waited twice that amount at least) but I’m not sure if I’d be experiencing period symptoms if I were pregnant. I feel like I’m on my period but I’m not bleeding... why? But is it normal for the pill to push off your period when you start? It’s my first time ever using birth control. I could use all the advice I can get! Help!!

UPDATE! I started my period! Yay! But also when I went pee I noticed something different.

My tampon was already soaked with blood after just a few hours which is fine but when I wiped before I took my tampon out... there was this weird substance. Sort of like when you have what looks like bits of your lining come out but this was in a huge clump... it was the strangest thing and it freaked me out. Is this normal??