Hi Melinda, i was bitten by a whitetip spider when i was 38wks pregnant with Ryan, i didn't notice it at first (I was already in hospital) but one of the midwives noticed that my arm was really swolen and red, over the course of an hour, my arm blew up to twice it's normal size, they called in a dr that specializes in spider bites and he prescribed some cream to stop the itching, which worked in 24hrs.
Ryan was fine after the bite it didn't affect him one bit.
I hope this helps