Education:Maybe TMI? But I need advice. Can you Help?

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Maybe TMI? But I need advice. Can you Help?
Okay. Two weeks ago I experienced severe cramping a few hours after sex. Then a few days later had cramps out of the blue--not bad but just not like my body. Now since then I have experienced tenderness when I have sex. My insides hurt? The pressure is more intense and honestly the penis feels like it is pushing everything into my stomach and is very painful? I don%26#039;t have a mom or a close girlfriend. So has anyone experienced this? Any advice to what it may be. If it continues I will be going to the doctor. I am on birth control. Any help would be much appreciated. Thanks!