Pregnancy depression or hormones?

Heather
Hi I am 13 weeks with twins. My husband and I TTC for about 6 months and I was very excited to find out we are expecting. How ever the past 2 weeks I have been severely depressed. Not just normal pregnant depressed but crazy depressed. I am not happy anymore, I thought bk the worst thoughts about both not making it and in tip of that I am freaking out about how to have 2 at one time. I never expected to have twins. I even broke down the other night and told my husband we should give one to our friends that can not have children. I wouldn't actully do it but it was just in the moment thought. Just wondering if anyone has any advice about this? I feel like a terrible mother. HELP ME