I had protected sex on Dec 3 and I got my period on Dec. 9 which was on time and normal two weeks later on Dec. 23 the condom broke and I took plan b a couple hours later. I'm now pregnant which one is possibly my conceive date

Most likely the end of December. Have you had an ultrasound? If so, what did it show as how far along you are? What due date were you given?

When I get an ultrasound they determine the fetal age by my lmp and not a conceive date. My due date is Sept. 14.