Should I give up my new dog?

We adopted a lovely spaniel a few days before we found out that we are expecting, at first everything was fine but I’ve having really bad symptoms. Most days I spend in bed with a bucket, luckily my dad has 2 spaniels and most days comes to walk ours too.

The first couple of weeks, he was amazing! We had no problems apart from a couple of toilet accidents (we knew that we happen) but now he’s biting at his leg quite aggressively and when my partner tried to stroke him to calm down he bit him a little. It wasn’t a proper bite and I think it was because he didn’t see it coming so he didn’t know that it was him.

I love him so much but I just feel like I’m not giving him what he deserves, the foster he was with before had loads of dogs and walked home 3 times a day nearly. She said he had bit his leg a couple times in the 3 months he was with her but he’s doing it everyday with us. I don’t know what to do.

I don’t want to give him up but i also want to do what’s best for him, he deserves to have the best life he could possibly have.