late on my period & I have a problem PLEASE HELP!!!!!

Hannah
I had my period regularly in November 3-8 I had sex the 11,15,20,23,29,30,1 the 15 was with my other S|O please help me.. I'm currently late. I had spotting after I had sex about 4 days ago.. & it felt like I was gonna start. My boobs hurt, I cramp every now & then.. I need advice