Last period?

Brook • Trying for our first blessing since July 2014
I posted alot about Boob changes 3 weeks ago, they where sore and the nipples had changed. But then on 11/19 my period had came and on time, 2 days early actually, but what I found strange was it was spotting the 1st day then heavy the next day and a half but then just spotted for the rest of the 3rd day, normally I have a very heavy 6 day cycle. I haven't tested yet because I'm not sure if it possible to have a "period" while pregnant. But I've been getting more symptoms, past 4 days I've been super nauseous, usually lasting till around noon, back pain and today I have unusual cramping, and yesterday I started peeing about every hour. Has anyone else ever heard or had a period while pregnant? SO thinks I am. I'll be testing tomorrow hopefully of i get my opks and hpts in the mail.