TTC, have PCOS, lost weight, now AF is late 3 days

I was diagnosed with PCOS about a year ago and have really focused hard on losing weight to help in TTC, and lost 70 lbs as a result in 10 months. I'm usually early when I get my periods, so being 3 days late is a HUGE DEAL at the moment. It is 13 days today since DPO, based on the symptoms. So far I haven't really had any "pregnancy symptoms," and I'm terrified to test yet because of how long we've been trying and how many BFN's we've gotten. Any suggestions?