Has anybody experienced neg hpt,neg blood test and no period?

I am 31 yrs old and was diagnosed with uterine fibroids and endometriosis earlier this year. I had undergone laparoscopy and they have removed my right ovary. I know both of my problems is tied with infertility but I was told by my obgyn that I will still be able to conceive. My question is, has anyone ever had an experience of getting negative hpt,neg blood test, still no period but still ended up pregnant? My last period was Sept 19, it was like my normal 1 day period. I tried using ovulation test during my supposed fertile week and I got a positive on Oct 2. We made love that same night then again on sunday night. My cycle is an average of 27 days so my expected period is Oct 16. I have very few symptoms, I have noticed nausea kinda like how you feel when you're in a car and you're reading a book and I always feel like I'm about to puke but it doesn't happen. I had a migraine headache last friday. My breast is just a little bit sore but it doesn't hurt to run or move. I have clear CM, I always feel like blood is coming out of me but, every time I check there is nothing, just clear mucus like I'm ovulating. I don't feel like my period is about to come anymore, I mean, no more period cramps, just some mild cramping I relate to the fibroids. I really want to have a baby but I'm afraid I might loose it buy doing my regular routines because I always get negative results. Am I just imagining this because I really want to have kids or I may be pregnant?