Hello, You had recently intercourse, yesterday only and do not accepted the act of intercourse suddenly, and had some anxiety, due to this anxiety you felt stomach upset, so first of all be free to think that nothing gone wrong by having intercourse and as your husband pulled out before ejaculation in the fear of pregnancy, but you felt bad by this act and possibly dissatisfied by your partner and had anxiety , which creates stomach upset to you, therefore for this very first you should be tension free and take some alprazolam 0.25mg at bed time and also take Omeprazole 20 mg in the morning empty stomach, you will feel much batter and your problem might overcome. Good luck and take care.