If your period ended two days ago the chances of you being preg. (especially feeling preg.) are really low. YOu usually dont ovulate until about 14 to 16 days after your period starts..and then you wouldnt really have many sympthoms until four weeks after your period (and for the me the only ones I had was extra vaginal discharge, the sore boobs didnt start until the about 5 weeks after my period). And it is four weeks after your period starts that you can take a preg. test, before that it will almost always be negative.
If you want to get preg. your best bet is to research and find out when is your most "fertile" time, and then go from there. But usually two days after your period is way to early.
I hope it works out for you, the strange feeling could be gas or something; but if it stays you may want to see your doctor.