Friend puts you aside

Hi everyone. I want to ask you ladies something, from a male perspective. My girlfriend and I have only been together for 4 months and, after an earlier unexpected miscarriage, we had consciously chosen to try for a baby. Now my girlfriend is 7 weeks pregnant and everything was fine; the heartbeat was there and the baby was about 1 cm. However, on the day of the ultrasound, she reacted differently than before. It seemed like she wasn't happy. She even went out that evening because a friend needed her. A bit weird, but okay, it can happen. I didn't make a big deal out of it. But that same evening we got into an argument and she kicked me out. For the next two days we still talked to each other, and we both said the contact felt weird and we missed each other. But she wants some space. We spent two more nights together, cuddled, had sex, and just acted normally. But the two days after that, she's completely the opposite. She's short, no more "darling" or anything like that, and it seems like she ignores me more. Also, she's shifting all the blame onto me. She says everything has become too much for her right now and she's blocking her feelings. She doesn't say she hates me or that I suddenly mean nothing to her.

Does anyone have experience with this? We're supposed to be enjoying this time together, not being apart and arguing... I know she's been having a lot of nausea and cramps lately, and now I can't be there for her in the way I want to be, which I find really hard. What's going on?

Thanks in advance for your replies.