Moving + overdoing it

I'm 22 weeks today and we are getting our house ready to sell. This means packing personal stuff and deep cleaning. On top of that I have a 2 year old running a muck all day too. My body is telling me to stop but there is so much to do. We have the realtor and photographer coming over tomorrow and I STILL need to mop the floors and clean up today's mess from my son playing. I feel like my cervix is going to give out on me and I've had diarrhea for the last few nights. I feel like my body is warning me to slow down.