Changes in weight can be a side effect of the pill. Some persons gain weight, some lose weight and some remain the same weight. 

If the condom bursts and no other contraceptive method was being used, there is a chance that pregnancy could occur. You may need to consider taking an emergency contraceptive pill (ECP). There would also be a possibility of a STI, you may want to get tested.

No, there is no evidence that ECPs will cause any harm to an unborn baby.

In terms of length, the female condom is the same as the male. However, it is wider than the male condom. This is because when the female condom is inserted, the warmth and moisture in the vagina allows the condom to stick to the walls of the vagina, which allows the penis to move freely. The female condom also covers the outer part of the vagina and the base of the penis.