Late period 😱

Renata ✨ • A long struggle ttc our rainbow baby, remaining positive & hopeful
So my period was due on the 1st & it's still not here! I had spotting yesterday for an hour & then nothing. I've had minor cramping & (sorry for the tmi) the runs like I usually do upon an approaching period 
I'm on 50mg clomid & 1500mg of metformin & this is round 2 & round 1 worked fine. 
My period can be irregular but since I've been on metformin is pretty regular. 
I don't I'll be pregnant because I had my rubella shot & we were careful this month. & I tested just incase the day my period was due & it was BFN 
Anyone have any thoughts?Â