Weeks pregnant clear blue?!?

Yvonne
My last period was March 5. We got our positive last Friday the 27th which was 7-9 days before my missed period. I'm due dec 10th according to last period. I took this this afternoon. According to clear blue that puts me at 4/5 weeks. Any thoughts. Multiples maybe? I'm still 2-4 days before my period should have come.