Feeling so down.

I’m 7 weeks and most of the time i feel so down. I’ve wanted to get pregnant and be a mom for so long and now I have it but I can’t help but feel sad/stressed/anxious/overwhelmed most of the time. It’s causing a lot of tension between my husband and I even though this is one of the happiest times of our lives. I don’t know what to do and I feel so guilty feeling like this and I just want to feel more excited and happy like I thought I would be. Will it get better after my first ultra sound? I don’t know what to do😞 i would love any advice please