I had my last period on February 24th, and about a week later I had unprotected sex once. He pulled out but I know it isn't a reliable form of birth control. Days later my breasts got really sore and felt swollen and they stayed that way for about 2 weeks, which is unusual for me. Yesterday, March 21st I started my period, which is the normal time it should've started. However it has been weird. Normally the first day it gets to a point where it is very heavy for several hours and is a dark red with clots. I also usually have strong cramping during this time. This period has been really light, it never got heavy at all. It is more than spotting, but it is no where near where it usually is. There has been no clots and no cramping and is a bright watery red. I am 35 and have always had a regular period. Is it possible I am pregnant or is it just a weird period?