also passing pill in stool metforminer 500

I found a thread hear about someone not digesting metformin and they see the pill floating in the toilet i also have this issue i take 4 of the pills and lots of times 4 will end up floating hours later,my mother being a retired nurse said like others in response to the other persons thread is that the shell may pass threw,so i finally decided to investigate and with 2 chop sticks i broke one open and it was clearly not just a shell,it was still dry about a third in to the center, so i was hoping for some advice, i know i need to contact my primary doc but i really have an issue with procrastinating when it comes to doctors, thank you