I think it's normal....is this something new you've been doing, or something that you've always done? If your body is used to it, you probably wouldn't be very sore, but at the same time you might just be more aware of the soreness now that you're pregnant. If you ever feel any bad pain, stop doing it and take a rest but otherwise I'd say you're just fine.
Edit: words
Me: 37 DH: 38
BFP #1 3/17/11 - DS born 12/4/11
TFAS Dec 2013
BFP #2 - 3/23/14 - CP 3/26/14
BFP #3 - 8/20/14 - Natural Miscarriage 9/22/14
BFP #4 - 1/28/15 - DS2 born 10/13/15 Surprise BFP# 5 - 9/2/16 - Due 5/13/17
Re: mopping and vacuuming
Surprise BFP# 5 - 9/2/16 - Due 5/13/17