Period was late, and it is not normal.. What could be going on?

Anonymous
My period was 4 days late. The flow is a lot lighter than it has ever been. I have had unprotected sex about 3 weeks ago, and I am not on any birth control. I have taken 2 pregnancy tests and both were negative. Sorry if this is TMI but normally I have to use super plus tampons for the first 2 days of my period and I have to change them about every 3 hours. My period just started yesterday the 29th and I used 3 tampons the whole day, and they weren't even full when they were removed. On the first night I normally bleed heavy enough that I have to get up and change it and also wear a pad. When I woke up this morning there was no blood on the pad and barely any on the tampon. Today has been pretty much the same. I have been feeling pretty nauseous and my boobs are more sensitive than normal. Also, I don't normally have bad cramps and yesterday I was cramping so bad I just wanted to cry and midol didn't help. Should I be concerned, and make a doctor's appointment? Anyone have any idea why this could be happening? Thanks in advance and I am sorry if there is TMI in this.
Period was late, and it is not normal.. What could be going on?
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