no, not unless you were pregnant from a while ago. pregnancy symptoms take a few months to show up, some women dont even get any. but they definantly dont show up the day after you have sex, your stomatch would be hurting for another reason, maybe he went too deep and hurt you, you have period cramps, are sick, ect? you should see a doctor to find out why its hurting, also to find out if your pregnant take a pregnancy test 2-3 weeks after you had sex (any sooner and the results won’t be accurate) in the morning with your first pee is the best time and take it when your period is due alternatively, see a doctor for a blood test this will both let you find out quicker and give you more accurate results
Nope its not possible. For one it can take the sp*rm 72 hours to fertilize the egg so even if you do get pregnant the chances of it happening instantly are verr slim. Pregnancy symptoms can take atleast a month or two to show up and stomach pain is usually not one of them. The pain your feeling could be from him entering you too hard and fast and hitting your uterus, or it could be something nonsex related and your just paranoid. Wait three weeks or until your period is due and if ts late take a test.