Negative test but body screams pregnant

I've never done this before but I won't see my OB for another week and a half. I need to know I'm not crazy. My first day of my last period (28day cycle) was 1 Aug. I would have ovulated 13-17. I had sex with the potential father at least twice within those days. (No protection--I was on the pill but Aug. was hit or miss on actually taking them) I'm 24 and not TTC. About 5dpo I experienced some unusual spotting, I never experience mid-cycle bleeding. It was mostly brown. At 9dpo I was already experiencing nausea and vomiting, the nausea lasts all day and the vomiting usually occurs immediately within 20mins of waking up. I was also experiencing excessive fatigue. I work two jobs and I've never had a problem till now. I went to the doctor because I wasn't feeling well so she conducted a blood and urine test-- negative for pregnancy and everything else looks great. Doc tells me to come back if my period doesn't start. 10-16dpo: My breasts become sore, start peeing all the time, begin feeling a pulling/pressure on my lower abdominal/pelvic region, temperature ranging 99.1-99.7 consistently, feeling "wet" down there. I check my cervix and it was high and soft and my vaginal walls feel unusually swollen. i've noticed a gurgling noise in my lower stomach. Experiencing food aversion: ABSOLUTELY NO DAIRY. I throw up on the spot and I've never had dairy issues. I use to drink dairy ALL the time. Period is a no show so I return to the doctor on 16dpo another blood test-- negative. I am absolutely baffled. My body is screaming I'm pregnant but all the tests are coming back negative. I go to my OB on 20 Sept. I am going to ask for an ultrasound, just to make sure and to see if there's anything else. I know my body, I know how I carry stress and something is not right. I've read stories about women coming up positive later in their pregnancies. I don't want to put too much stock in that, but I keep telling myself to believe my heart and body and both of them are telling me I'm pregnant. Any advice? I feel really lost right now.