Pregnant and toddlers

I'm a nanny and I'm 7 months pregnant and the kids I watch are twins 2 years old and a 5 year old the 2 year old one is good behaved the other is horribly misbehaving she kicks and bites and scratches and the mom doesn't do time outs or slap or even tell them no she just asks whats wrong and she will hand the 2 year old to me well she's kicking ND I'm scared she's going to kick my stomach she has a few times and even tried to punch my stomach and I don't know how to do my job being pregnant if I wasn't pregnant I would just ignore the bad behavior but I'm pregnant and Idk what to do