I've been avidly journaling everything since last month, so I have a lot of details I can give. Sorry if this is too much, but I'm pretty confused.
My cycle is always almost exactly 30 days long. It started on 3 October, and ended on 8 October. DH and I had unprotected sex on 14, 16, 17, 18, 19, 20, 21, 22, and 23 October (not after that- he is in the Marine Corps and left for predeployment). On the 19th I experienced slight nausea following meals. On the 20th, 21st, 22nd, and most days afterwards, I continued to experience this. On the 22nd, I also had some slight cramping in my uterine/ovarian area. On the 25th, i had localized pain and cramping in this same area, consistently for around 2 hours.
Every day since O-Day, I've had a temperature of around 99.4F, which is slightly elevated for me (I'm usually around a 98.3F). Today (4 November) I had some vomiting following dinner.

I'm 3 days past expected AF. I took a pregnancy test on the 30th, and again this morning. Both times it came back negative (I wasn't misreading it- it was a digital test). However, I have had NO sign my period is coming anytime soon. I typically have horrible breakouts cycle days 27-2, but my skin currently is the clearest it's ever been, even when I'm NOT having breakouts... (I've even had people comment on how clear my skin looks). I don't even have a trace of oil on it!
Additionally, typically I'm very bloated at this point, and I've had no bloating at all.

Is there a chance that my tests are coming back as false negatives? I know by now on an HPT I should be testing positive if I'm pregnant, but I have no explanation for the other stuff, such as lack of period symptoms, my nausea, or anything.
I'm not abnormally stressed at all, either- sometimes that's led my period to be late before, but actually, in the past two weeks, I've felt very stress-free.

I'd just like to get someone else's take on things.


ETA: I also have had clear-to-white, non-odorous discharge for the past week. Additionally, yesterday, both my husband and best friend commented my breasts looked larger- they seem to be having trouble fitting into my standard bras currently. I've also had significant lower back pain from midlow back to my pelvic area.