Ladies help!!!

I am trying to conceive my rainbow baby I am now 12 days late for my cycle which is very regular due to the metformin ive been on for over a year and a half I am having symptoms and my breast seem larger but all my hpt keep saying neg.. this is very nerve racking for me bc idk what to think. Am I too anxious, should I go see my Dr, I just don't wanna look like an idiot asking the same ?s Again "am I preg. This time?" I'm praying so hard I am..but how far along was any of u mommy's before ur test showed POS results?