Brown Spotting and cramping after period? tmi

I am currently on the nuvaring. Have been for about six or seven months. I took my ring out on the 29th of January and started my period the next day which is extremely unusual. It wasn't as heavy as it normal is either. Anyway I put the ring back in on the fifth and I stopped bleed the next day. However On the seventh I started spotting a light pink with tiny clots and a couple days later it turned to a light brown discharge. It's been followed by some pretty sever cramping the past few days as well. I haven't had this happen to me before on the nuvaring and I'm wondering if anyone else has experienced this? Could I possibly be pregnant or what? Any Advice?