Help...don't know what is going on here...?

I am a 28 yo mother to 3 children, ages 10,8 and 7. My husband had a vasectomy 6 years ago, and came back clear. I am 10-12 days late, my LMP was June 3rd. I very heavily ovulated around June 17th because I spotted brown for a couple of days and had TONS of EWCM. Well, on day 8 of being late, I spotted pink and brown, and it has stopped today. I have taken numerous hpt's and they are all negative. I also went in for a blood test today at my doctor, and it was negative too. The blood test is the one where they put drops of blood on the cette and if it shows 2 lines its positive. Sorta like the dollar store hpt's. My dr said that she wants me to retest this weekend with another hpt, and in the meantime get an appt with my OB/GYN and have another blood test and an transl ultrasound. My have enlarged, I have sticky clear nipple discharge, nighttime indigestion and nauea bouts. I haven't been under any unreasonable stress, and I haven't had any new meds, etc. Has anyone went through this before and ended up pregnant?