What is wrong with me?

So he proposed.

Been together 2 years 8 months. Live together. 7 months pregnant.

It was beautiful. Everyone we loved was there, he got it on camera, got my grandma's blessing, he got down on one knee....

I thought he was joking at first, I was slightly hurt and mad but, he was serious.

I cried, hugged him, said yes, forgot about the ring entirely until he grabbed my hand.

My stomach jumps when I think about it. Not in an upset way, in an excited way.

But he's concerned I don't want to be engaged because I shift jump up and down, I looked pissy, I didn't fly over the moon in excitement, I wanted to be sure he was serious....

I feel like every good thing that happens to me is going to end negitively. I could find the bad in a pot of gold.

I feel like I pressured him into it, he says I didn't but I still feel guilty. I feel like he is going to change his mind, like proposing was an accident. A pretty damn elaborate accident, but still, it could happen.

He's upset I haven't checked out the ring much. I haven't been able to say fiance or wedding, or engagement... I feel like I physically am not able to. I try and... it doesn't come out.

What is wrong with me?