How should I read into this?

Normally, I'd say there's not enough information to go on, but I very much remember the rest of the back story here, so...

Okay, here's what you should do.

(And this applies to this, and all future questions about your ex pregnant gf until the baby is born, or you get back together, or you decide to give up on her.)

"How should I read into this?" You shouldn't. Stop trying to read into anything. She's obviously confused and so are you. If you aren't comfortable enough with each other to say/ask exactly what is meant, then you'll just have to muddle through. Trying to read into things which may or may not exist is nearly impossible, and will only cause bigger problems and more misunderstandings later.

If she broke up with you, she has no right to say anything about anyone you do or do not date or talk to. Tell her that.

If you want her BACK, you shouldn't be dating or "talking to" other girls "that way".

She's pregnant and hormonal. She needs space. Give her space. But do /not/ let her walk all over you or go off on you for nothing. You /both/ need to learn about boundaries.

Keep trying to make doctors' visits and keep up on what's going on with your baby, but beyond that, any attempts for the two of you to socialize /right now/ are going to end poorly.

Until she's made up her mind, or until you decide to move on, you both need a break.

Don't try to justify your actions to her. It's none of her business that you didn't hook up with the girl. Discussing it is only going to lead to arguments and frustration.

Back away. That's my advice.

Time and Space.

Best of Luck~