Pregnant...but trying to figure out date...HELP!!

Roxanne
Hi everyone!! I just took a pregnancy test, and I'M PREGNANT!!!! So I downloaded this app having used the other <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a> to get pregnant. I'm trying to figure out my last period though...my last period was not a normal period. It was 3 days of spotting. Do I count it? Or do I go with my last full period? Thanks in advance!☺️