Weight restriction

Hey there! I was on the pill for 3/4 years and then decided I wanted to lose some weight. I'm still currently in the process of losing weight, I did ask my doctor if I could come off the pill with me trying to lose weight and he was fine with it. Then I went back a couple of months later to see if I could go back on and he said I should stick to condoms. I did ask him if there was a weight restriction due to a bad experience I had with another doctor and he said no. But now I can't quite work out as to why he doesn't want me on it. Apart from a bit of extra weight I'm perfectly fine. Is there actually a weight restriction? I'm so confused, condoms are fine but I used to enjoy the security of the pill and the condoms :(