not sure if this is ok to post here (if not please delete)

I'm ttc but I keep gaining weight like I look like a giant cow right now my belly is rounding out but there's no baby in there! my heart just keeps hurting because it's like everyday I get bigger it seems with no baby!! I've cut back on what I'm eating I opt for healthy food and water but nothing is helping the drs say if I loose some weight it'll help with getting pregnant and what not but idk what to do! I feel pregnant but the tests say negative