Hi there ~
It can be really scary to have these things happen to you when you are doing it the first time around. I would still advise you to get a urine pregnancy
test done. Once you do it you will find out if you are or are not pregnant. I suggest that you also visit with a physician to find out if you have anything going on in your tummy. I believe that the physician should be doing an ultrasound
test of your abdomen to find out if there is any pathology that needs to be treated. I hope this helps and please have protected sex if you really want to.
Take care of yourself and have a lovely day !