Am having abdominal pain and feeling as to poop...

is your symptoms related to pregnancy ?
diarrhea is not one of the common symptoms 
does previous menses means not being able to get pregnant ?
previous menses and periods only refer to the previous period not the new following one 
What are the options of pregnancy tests ?
1. HCG hormone level blood test
2. home pregnancy test ( urine ) 
3. ultrasound test ( in clinic ) 
How early can you do those tests :
1. HCG hormone test : 25th day of the current period
2. home pregnancy test : first week of the next period 
3. ultrasound test : second week of the next period 
Early pregnancy signs :
1. delayed period 
2. increase vigainal discharge 
3. abodiminal discomfort 
4. change in mood status