Pls give opinions!

I had an incident on July 16th and I took a plan b within 48 hours after. I ended up getting my period 7 days later and it seemed to be a pretty normal flow (not too heavy and not too light). My boobs have been so sore and I feel like my nipples look different but I may just be paranoid. I was supposed to get my period yesterday but I just started spotting today. I have really bad cramps but do u think my spotting is just my period starting? I am freaking out and need ur opinions!!