Babys not moving?

Dominique
I'm used to being able to feel my baby move, like small fluttering and little kicks. I'm 17 weeks almost going to be 18 weeks in a couple of days. Today I haven't felt her move all day and I'm kind of concerned. I drank some Pepsi and ate some ice cream I hopes that the sugar will make her become active. But I don't want to seem to over dramatic or anything so I'm not sure what to do. Any suggestions?