Pregnant with a sick baby.

I baby sit a baby who is 6 months and his mom loves to use me and not tell me things she makes it seem unintentional though. I told her my doctor said I need to stay away from anyone sick since I've been sick 3 times already, I told her if her son were to get sick she'd need to let me know so we could work out another day for me to watch him which isn't a uncommon thing we've had to do. So her husband brought their son today and he told me he was a little fussy soon after he left I found out he wasn't just fussy. He is sick so once she texted me I texted her and asked if he was sick and she said yes but not sick sick? Which is also not true. She said he is very congested with what looks like sinus infection mucus. What should I do? This isn't the first time she's done something like this and I know she's not clueless because we've talked about more then once. She once told me she was willing to take the risk to bring him over here when he was 4 months when I had bronchitis. She does it because she doesn't get much sleep. But she also tells me he sleeps through the night.