Last 2 months, my body has been acting crazy.And I don't know what to make of it.

Last week I had my period, though I had the feeling it was a litlle different.3 Days after my period whas over, yesterday, I lost a little bit of blood,really minimum, and a few cramps going along with that.Now this morning, I woke up feeling sick to my stomach and light headed.Can someone please tell me anything about their experience with this or what they think it can mean?