Cramping and light period?

I've been trying to get pregnant for about 3 months. I stopped my Nuvaring and had an 8 week cycle, followed by a typical period. Now, 5 weeks later, I'm confused as can be. I took a test 4 days ago and it was negative. Then I started cramping, which usually doesn't happen prior to me starting, but I didn't think much of it. Now I've had 3 days of light bleeding, which is very strange for me. Usually I have a light day followed by a few very heavy days. Anyone else experience this coming off of birth control or otherwise?