24 weeks pregnant

Hey guys I'm 24 weeks pregnant and I've just come home from walking around at the markets for a few hours, my stomach is feeling very tight and then I keep getting a sharp pain that comes for a few seconds then goes away and it's done that a few times it's not unbearable but it's uncomfortable, should I be concerned at all? I'm just about to have a warm bath and see if it helps but any advice is appreciated :)