Day 3 of missed period

Hi, today is day three Of missed period. I’m not having any cramps nor pregnancy symptoms. I’m on metformin and I did clomid last cycle but this cycle was natural. Would that have caused a late period?

I am also having regular looking CM, a little watery but not fertile looking CM... any one have an idea of what’s going on? There is no sign of AF 🤔

I took a PT but it was negative yesterday night. I did drink a lot of water but I’m not sure that would make it be a false negative.