Are you sure they are stomach pains? Or are they lower abdominal/pelvic/groin pains? I wouldn't jump to the conclusion of pregnancy just yet - even if you were pregnant, pain shouldn't get very bad as you described.
..........................
Here's some questions to ask yourself (no need to share them here if you don't want to ^-^):
- do you have a watery white/clear vaginal discharge?
- do you bleed between periods and/or after intercourse?
- are your pains accompanied by nausea and vomiting?
- is the pain constant, or does it flare up only at certain times?
- does the pain worsen with physical activity (walking, jogging, exercising) or with extended periods of sitting?
- are you experiencing any breast soreness or tenderness?
- do you have normal bowel movements, or do you fluctuate between constipation and diarrhea for no reason?
- have you lost weight?
- is your abdominal area swollen, or does it appear larger?
....................
The first two (discharge, bleeding)
might be a sign of cervical cancer, along with your pain following intercourse. The others could be a sign of endometriosis, ovarian cysts, uterine fibroids, or even irritable bowel syndrome.
I am feeling pain in my pelvic area, along with bowel troubles, nausea, and pain with some kinds of intimate contact (not sexually active), much to my guy's disappointment

. I'm thinking I could have any one of those four illnesses.
But i'm glad you're not stubborn like me and you're seeking help...I've been having my pain for over 2 months and I refuse help. Please keep us updated on your status!
I wish you luck, and alleviation of your pain.
..............
A last note: blood tests are foolproof - they locate hormones produced by the placenta as early as a week after conception. So if you got a negative back, then I wouldn't worry about pregnancy, dear.
................
Scaredbaka - feels like crap