I was 5 days late starting my last period which is very unusual because I normally have an "exact day around the exsct time' regular cycle. I took a pregnancy test before starting and it was negative. My period is normally 4-5 days long but this one lasted 7 full days and two days of brownish spotting. Today was the first without spotting, and my husband and I had intercourse. After sex, there was a considerable amount of light pink blood on the sheets. Is this something I should be concerned with?