Low sex drive is it because i'm taking birth control pills?

I've been taking birth control pills (Orthocept/Solia) for about 5 months now. I started taking them because i was having my period every two weeks for 5 days and it was extremely painful. Soon after i started on birth control i gained ten pounds in about 1 1/2 to 2 weeks, (i've since lost some of the weight and it was evenly displaced. So i just went up two jean sizes (a 1 to a 3) and up a bra cup size (a 34B to a 34C)) I have also noticed another thing i have a very low sex drive, my boyfriend can not get me to orgasm while he is fingering me, and i'm not very mentally engaged, i wasn't like this before i started taking the birth control. Is there something i can do about it? Will switching prescriptions help? Do other medications (ADHD medication) i take effect my sex drive when added with the birth control?