#1677 - I had unprotected sex

Hi, dears.. I had unprotected sex and then took contraplan 2 but since I took it and I am having a very bad migrain and feeling extremely tired, and after 5 or 6 days I had bleeding not to much but once or twice during the day.. Is this normal as I took it before and nothing happened.. Does that mean that I was going to be pregnant or what??