Period is late!

Or

So I am 10 days late. My fertile window was Jan 28- Feb 1st I believe so. My bf and I have been ttc and did it during my fertile window. I also have pcos so missing my period is normal to me because they’re irregular. This past week I’ve been feeling tired and today idk why but I’m fatigued. I did take B12 pill earlier so it could be because of that , it is my first time taking the B12 pill. Any ideas or advice?