i'm 25, i am currently not on the pill(i ran out in like october, but i'm planning on getting the insert), and last time i had sex was at the beginning of December. I had my period on Christmas, then started again on the 5th and i just started again tonight. What is going on and should i see the doctor?

It's all normal symptoms too-a little cramping, heavy the first 2 days then drags on the next four. No real mood swings and blood appears to be normal color.