Hello dear,
I understand your concern
In my opinion it appears that the urine
pregnancy test was done early.
Usually the urine pregnancy test gives accurate results a week after missed period because HCG the hormone responsible for positive test starts appearing in urine around that time.
And even the symptoms of pregnancy like nausea,vomitings, increased urination,sore breasts start 2 weeks after missed period.
The first sign of pregnancy is missed period.
So I suggest you to check for the period.
In case if it is delayed go for a urine pregnancy test.
It is too early to test for pregnancy and also to feel any pregnancy symptoms.
As there is pain abdomen I suggest you to get physical examination done and also if needed
ultrasound to rule out the cause for pain.
There can be possibility of urine infection also.
But chance of STD might be rare as you don't have any altered
vaginal discharge and no lesion over genitalia.
Anyway physical examination helps in accurate diagnosis so kindly
consult doctor.
Take adequate fluids upto 3 litres per day to prevent
urinary tract infections.
Avoid stress.Relax.
Hope this helps.
Best regards...Dr.Srilatha