pills late..spotting and unprotected before my period ...Im

I was wondering if anyone had any advice. I had unprotected sex last night. about 2 weeks ago I missed about 2 pills....I took them morning and night to catch up but started to have some spotting as a result..I have been taking my pills regulary for the last week. I finished my last pill this sunday and I am expecting my period any day now...usually about wednesday..My concern is that i was spotting when I had sex. verry light..beacause of those pills ..and I am just expecting my period. am I taking a high risk on this one? Im considering the emergency after pill. But am I silly since Im on the pill already? I should have used back up. I just need some advice