I'm 3 days late

Alecia • Mommy of a very Handsome Boy!

So, my husband and I haven't done the BD Since Dec 30, I had a period in Jan, a normal one, and now im 3 days late, I haven't bought a test yet I don't get paid until the 22nd, but we haven't had sex since then. Should I call my Dr? or is it possible to have a last period before they stop? I can't remember with my son, its been 10 years. Help! I'm so nervous