Enough is enough

Delanie
My job is very physically demanding, on my feet constantly and wrestling animals. Lately, besides battling a cold and being a mom to a busy 3yr old, being 30 weeks pregnant is kicking my ass. Lack of energy, dizzy spells, varacose veins, inability to sleep etc. 
When does everyone plan on going on maternity leave??
I'm finding it hard to I feel very guilty determining when enough is enough