I'm 25 weeks..I had a really bad chest infection at 23weeks and had to go on antibiotics for 10days.The 1st 2days my baby wasn't moving as much. Afterwards he was back to a normal routine. I'm sure it's nothing, but you should still get it checked out of it worries you.
I've been sick a lot since week 6 and am 23 weeks now, baby still seems to move after though. I didn't really feel her until week 18/19, how far gone are you?