anyone feeling so low and have no idea why???

My first pregancy and its so stressful I had cramps 4 weeks ago so the doctor sent me to the early pregancy unit and I had a scan they couldn't see anything a week later they saw a small sac at 4mm 5 days later it was 9mm and now I'm waiting the 2 week wait to see if it has a yolk and embroyo . The whole thing has been so stressful
And upsetting I feel so sad and depressed and offen end up crying everyday . I don't know why I feel like this?? I guess I'm worried that my body may have failed me ... I read up so much online . My bf is getting way too excited too and it's killing me what if there's no baby next scan?? 4 more days till I find out .... Waiting game.
Also depression has hit me hard can't stop crying I offen find myself laying in bed and not wanting to get up.ive put on a lot of weight which now I just look really fat not pregnant and I feel I've lost a lot of
Confidence not wanting to do anything or see anyone . Please help anyone felt like this feel I'm losing my mind??? 

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