Lately I have been experiencing a high sex drive and feel like my body is totally changing!?

I am 25 and have a boyfriend of a year and a half, and in the past year I have noticed my body is really changing. I keep looking for info on the female sex drive and all I can find is literature on a low sex drive. Anyways, I can literally feel when my hormones kick in and I become moody, or in the mood.. Also, I am of average build and I ride a bike to commute, which is pretty consistent exercise, but I seem to be gaining weight in my hips! About 2 years ago, pre-boyfriend, I was equally active but weighed less. Also, I have been thinking of the possibility of having a baby.. a lot. (of course this is something I would discuss with my boyfriend before doing) Anyways, what I want to know is can a high sex drive aka the desire to reproduce effect weight gain in certain areas? I used to be on the depo but have not had the shot for about 14 months, and according to the health info, it takes about a year for the depo meds to leave your system completely.