Should I see an OB/GYN?

So, back in February I got off the BC Chateal. It keeps me from ovulating. Since then my periods have been 3-5 days, with nearly no PMS symptoms before or DURING af. Also, it's super light and barely fills a super tampon every 8 hours. Before I got on BC and during when I was on it my af was super heavy. I'd fill a super tampon every hour and I had crippling back cramps.

I have never seen an OB/GYN. I'm also only 18 and a half. Right before I stopped BC, I'd missed a few pills and the condom also broke. However since then I haven't had a BFP at all...I'm just sort of freaked out that my periods changed so drastically! What do you ladies think?