I had unprotected sex the day after my period. (My period was.February 8th to February 12) On February 13 with my bf. I took plan b one step the next day February 14. Five days later I started bleeding it was heavy the first day then lighter than I normally have it . It lasted for 5 days I'm not sure if this was a period ( my normal period lasts for 6 days) My normal period is due march 8th I'm not sure should I be worried if it doesn't come. Pls help