Worried

So my husband and I have 3 cats, 2 of which we rescued, feral, and 1 in which we adopted. The cat that is adopted is super well behaved and clean. The 2 feral cats we are worried might still have roundworms or some sort of infection... We haven't yet been able to get them to the vet... Anyways, the one rescue which is a boy recently has been going in the litter box and coming out with creamy shit on his paw, I've been real good about catching him almost immediately and my husband gives him a bath everytime... My first doc that I seen when I was 10 weeks pregnant said she wasn't going to test me for toxoplasmosis, since I grew up with cats I was probably exposed to it before earlier on, but does that matter? I just hope my baby is ok, I have a new doc should I ask him to test me? I'm 18 weeks and my next doc appointment isn't until 20 weeks... I just have heard horror stories about still births and miscarriage from baby being infected from cat.... Is this something that would go undetected or would I become very sick????