Period!! Starting to get concerned

Michelle
So my boy is 1 years old yesterday...formula feed. My period started back up about 3 or 4 months after the birth...its been all over the place to the point where it was hard to keep track of. But now it's starting to be regular. Back in the end of March I had a 2 week period. It would stop and then start back up. April was very watery and bright blood. May I'm now starting it and it seems to be the same....watery and bright. Looked online of course saying pregnant but I took a test last week and it was negative....others are saying menapaus....im only 27. So what are your thoughts other than see a doctor....