Anyone have a mean cat, trying to conceive

Ma

I'm in a horrible situation 😢 I have two cats, they have a love hate relationship with eachother, they sweat at eachother, trip eachother going up the stairs, bite eachother (gently, never hard enough to leave a mark). but they cant stand being alone or without eachother. They are both very sweet and will cuddle up with me all day. Today, I squatted at the end of the stairs, and my cat at the top came running down to me. she rubbed up against me twice, and then bit my arm, not hard enough to leave a mark, maybe because I pulled away, but I dont know why? Anyway, my husband and I are trying to get pregnant, and it just worries me how the cats would act with a baby. but I dont want to get rid of them. Anyone relate? or advice?