Depressed

Do you think it's possible to get depressed when pregnant? Im 11'weeks and I'm happy I'm pregnant but I don't leave the house coz I'm sick all the time and I try and clean up but then I'm sick I have 3 other children to look after and I'm finding things so hard I'm usually full of energy I go gym 4 times a week not been for so long. I don't even make myself look nice. I feel like I'm fat. I'm taking it out on my husband by being a bitch I'm just so fed up I cry coz of the way I feel. I don't no what's wrong with me.