If i stop taking metformin will it cause my period to be late?

the dh and i have been ttc for a while now after a m/c 3 years ago. he works off shore so he isnt ever home around that time of the month. i was diagnosed with pcos 5 months ago and put on metformin. my period was like clockwork even before the metformin. i quit taking it about 2 months ago cause of the symptoms (yuck) and both cycles october and november were like clockwork! last month the dh was actually home the day i o'd and we did blenty bd'ing... af is now 2 days late and i was wondering if it possible for af to be late cause i stopped the metformin or if there is a possibility this could be my month. i have been super tired lately and had none of my normal pms symptoms (sore bbs, bloat, irritable) and occasional nausea.