I have never experienced veiny breasts before my period, and suddenly, just this morning, I find that my whole chest is veiny and my breasts are swollen when they definitely weren't as much yesterday. I also woke up this morning with an extremely sore shoulder joint from god-knows-what, and just three days ago had lotion-like creamy white discharge. I've also been experiencing quite a bit of gas (over the past two months), lower abdominal cramping, (starting just a few days ago) fatigue, and lower back pain. My periods have been irregular, ranging from a 23-28-32 day cycle, and I'm expecting to be on it next week (going by the 28 day cycle). Does this mean I'm pregnant?

I haven't even had sex yet (no penetration). My partner's penis only touched my vaginal area a couple times, and he didn't even ejaculate to boot. I know for a fact that there's no sperm in precum (found on goaskalice.com and various other health sites) unless he had ejaculated earlier and hadn't urinated, which he didn't. Also I was not on birth control.

I'm getting frustrated from not knowing and seeing all of these viable possibilities of me being pregnant or not. Please help me with this.