Tri-sprintec birth control side effects? nausea? weight gain?

so i was recently put on birth control because of my anemia. i was put on tri-sprintec and i wanted to know if anyone on it has eexperienced any side effects. i am on the 5th day and i have been nausea and has had a loss of appetite since like day 2 or 3. has anyone else experienced this and if so how long before you felt normal again? also did anyone experience weight gain..how much and how long after starting the pill. thanks!