According to the data you reported, you might be experiencing pressure caused by some of the pelvic muscles. During erection, some of the pelvic muscles might involuntarily contract and thus put pressure on some of the surrounding organs. Since the contraction might be strongest during ejaculation, strongest pain is also expected at that moment. The location of the pain (pelvic and abdominal) might seem a little too far from the pelvic muscles, but please keep in mind that our body sometimes can change the perception of the location of the pain.
You might want to visit a urologist for your condition and have a ultrasound which might help visualize a potential cause.
Meanwhile, you might want to try changing the position of the body (especially the position of the legs towards the torso and each other), in order to try to relax the pelvic muscles.
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