Hi thanks for your question.
I can understand your concern.
There are few points in your history to cheer up.
The first being your boyfriend ejaculated on your abdomen (what you call as come out on your stomach)
The second being, that you have taken emergency contraceptive pill
Third, that your four pregnancy
tests came negative.
You have not mention in history your last menstrual period.
Since you’re very tense, tension is one of common causes of delayed periods.
First and foremost, relax.
Take pregnancy test 10 days after the missed periods, I hope, it will come negative.
If pregnancy test turns to be positive, you can take medicine or abortion
For your stomach ache you can consult your Doctor.
Hope the information i provided to you will be beneficial to you.