Period or implantation bleeding?

Sarah

So I’ve been on metformin for three months for my PCOS. My doctor was hoping it would get me regulated and my boyfriend and I want to have a baby soon. haven’t had a period since early March.

Well on Thursday I got really excited because I went to use the bathroom and there was blood. Thought I started my period. Friday-now nothing. No blooding or spotting.

Anybody else have this problem? What do y’all think this is?