Too bad. You're now not meeting her sexual needs, and there are many men (like me) who'd love to take care of her (even when pregnant).
Yes I get that, Being offered "Six" instead of Sex can be a real turn off, Just be honest with her and sat that although it is nice kf her to offer you "Six" you'd much prefer to have Sex instead.
You didn't specify whether it's the pregnancy that's the problem or was she not giving you what you wanted before you decided to knock her up and essentially "bind" yourselves to each other even further. Without knowing the exact details, it sounds like you just didn't communicate soon enough. Then again, what's stopping you from telling her what you like? Unless you've realized you're gay or need something else that's impossible for her to provide, what's keeping you from talking about it?
I'll fuck her mouth, pussy and ass, if you can't be bothered. She's probably getting somewhere else anyway. Sure the kids yours.....