I have been having butterflies in tummy I am 10dpo could I b pregnant?

I also had pain in my lower belly two days ago.

Just from what you wrote, it could be anything or nothing. Is your period late? Any other symptoms? Here's in some info on pregnancy symptoms:
http://www.webmd.com/baby/guide/pregnancy-am-i-pregnant

The only way to really tell is to take a test, either a home test or at your doctor's office.