Trigger Warning! -not happy with twins

We have a 4 year old son and we started trying for another baby just under 2 years ago I’d say. We lost a baby this past April and it was devastating for us. The end of June we found out I was pregnant again and we have been over the moon, but lately the feeling is different for me. Lately I’m SO upset/sad about it being twins the closer we get to the end. I’m just about 30 weeks and each day I feel more sad and I don’t know why! Please tell me Im not the only one who has felt like this ?!??