I think most manufacturers normally put the weight limit at a pretty safe region to cover their own butts so if you're just a bit above you should be fine. That being said I'd take it slow on it and just walk just to be on the safe side. Also, do you have hand weights at home? Maybe you could use them and just do some body weight exercises in the meantime? There are tons of great body weight exercises out there that you can do in your living room.
ETA: congrats on your weight loss so far, that's AWESOME!!!!