Maexeni combined pill?

Be
I'm 15 and I went to a walk-in sexual health clinic yesterday to get the pill. After the nurse asking me a load of questions, she gave me the pills and it's a 21 day pill for 3 months. It's called Maexeni. 
I was just wondering, do any of you take this pill or have taken it? Is it a good pill? I must say, I woke up in the middle of the night feeling nauseous. What are the side effects? I'm most worried about gaining weight😖
Thankyou x