If i had sex on the 25th would implantation bleeding show up now?

Implantation Bleedin: First, implantation bleeding is not as common as everyone seems to think it is. Secondly if it does occur it would happen 6-12 days after conception. So, you would be in that window. The only way to know is to do a pregnancy test. If your periods are now regular from the Metformin wait until you miss then check a test. Good Luck!