somethings just not right

I can't shake this feeling that something isn't right. my baby hasn't been moving like normal. Hes been extremely less active over the last 3 or 4 days. Hes moving but it's just not his normal frequency or strength. everytime I think good he's moving he stops very quickly after and I don't feel him again for a while. nothing even stimulates his movement. when I eat, drink, or push on him he barely responds or not at all. some times I'm getting 10 movements in an hour or 2 sometimes I'm not. Hes gone more than 2 hours without making a movement. this is my 4th pregnancy so I know sometimes changes can be normal but this doesn't feel normal. I'm going in when my husband gets home for an NST but I'm just a nervous wreck. I can't stop crying. Hes being watched for IUGR so that definitely isn't helping my fears. I've never felt this worried about one of my babies while I was pregnant. I just feel it in my bones something is wrong and I feel like no one is taking me serious