should I be concerned?

I'm currently 27+2 woke up this morning with gas pains in my belly which soon turned in to frequenting the toilet, I haven't had a bowl action since 11am it's now 5, I haven't had anything to eat all day as when I tried it made me feel ill, I know have belly pain again, but feel as though I can't use my bowls but feels as though I could be sick, has anyone had this problem before, should I be concerned?