late period

My period is now 5 days late. I stopped birth control in July once I got to the placebo pills. I also had sex that same I week right before my cycle started. I don't think or feel like I'm pregnant but I'm also not sure why it would be this late either. Is it possible I was ovulating that week even tho I shouldn't have been bc the birth control was still in my system. Or could it be late because I stopped and didn't take it this month. I'm  also afraid to tell my now ex bf bc last time I thought I was late he tripped out on me and said some hurtful things. I'm scared and feel like I have no one to turn to. Advice please?