Ladies I could REALLY use your advice!

So I've always been a very small girl, I'm at the heaviest I've ever weighed and I feel so much more confident in myself than I ever have before. I'm 21 years old, 5'7 and I weigh 115. I've noticed that since I've been on birth control that's when I finally started gaining some weight. I would be even more confident in myself if I could gain a good 5-10 more pounds!! Does anyone have suggestions as to what I can eat or what supplements I can take that will help me gain weight faster? I want to do it in a healthy way , it's just not the easiest thing for me to gain weight so I need something that will really work. Please help a sista out!!! ❤️