My last period was light and only 3 days maybe 4. Pregnancy test negative. Body possibly regulating because periods used to start around the 15th, but after two months on the pill they were happening around the 30th. Last period 3rd to 7th of Dec. Stopped the pill 4 months ago was not on it for birth control. I haven't taken a pregnancy test lately but I took 4 and all were negative last month and the last test was two weeks ago. Really wondering why my body is so wacky. I have gained about 20 lbs since I quit walking which I'm started again last week. Help I'm confused.