Still a chance? Comments greatly appreciated!!!

I'm getting close to 60 days since my last AF. My husband is working out of state and comes home on the weekends. We have had unprotected sex every weekend. My boobs are very sore and my sense of smell has heightened, as well as a few pounds of weight put on. I took 4 hpt all BFN. I'm scheduled to see my doctor in two weeks for an ultrasound. Has anyone else experienced a pregnancy with BFN hpt??? I try not to let my mind get to me, but I'm still holding out hope. Any comments are greatly appreciated!!!