I am in the same situation as you my cat Tari is 11 months old and she is pregnant, I had her brother Taz neutered last week, but not before she got pregnant, I’m not sure how far along she is.I am hoping that it’s my neighbours black cat that got her pregnant and not her brother, all I can do is wait and see, I just hope it turns out ok in the end.
I had waited to get her neutered because she’s so tiny and it’s a big operation and I decided to wait until she showed signs of calling and flirting, but she didn’t show any of the signs of being in season, it probably wasn’t the best idea I have had.