hello stomach cramps( pain) can be due to early pregnancy but they can happen in lot of other conditions like premenstrual cramps, gastritis, gastroenteritis or urinary tract infection please mention clearly ur date of being intimate & date with month of getting this periods & also last month periods did u get periods this time after sexual contact if yes were they on expected time & were they normal in flow if u had periods after sexual intimacy on expected time ( means they were not delayed ) & if they were normal in flow as always, u r not pregnant testing is not required if above is not the case with you please get home urine pregnancy test with first morning urine sample . blood test ( bhcg ) can help if in doubt hope this helps you