TTC Advice?!

Cassandra • 🌈👶🏻 due September 2018
My DH and I TTC'd for 13months before we got our BFP that ended in a M/C at 8w2d. We are currently on our 4th cycle of TTCing again. I'm on cycle day 49, normally my cycles m are 39/40 days long due to my PCOS. I tested like a week ago and got a BFN, my DH wants me to test again at the end of the week if AF doesn't show up. I'm getting some symptoms like frequent urination, being nauseous, moody, tired,gassy etc.. I wanna test but I'm scared for another BFN. Advice?