Late period again!

alre15

So I’ve been on metformin and the first couple of months my period would come on time but lately it’s been everywhere. And I hate when it’s late because it gives me a bit of hope that I’m pregnant and then when I test it’s negative. I’m a week late this month and I really want to take a test but I’m afraid of it coming up negative. We’ve been trying for baby #2 for months now.