My mom wants me to go on birth control

Today my mom and I were walking around the mall and she told me how the other day she saw me and my bf in the basement, and when she came downstairs she saw him move quickly and put a blanket over himself. For reference we were not doing anything so I think she took what she saw out of context. I told her today that I have never done anything and that I didn’t know what she was talking about because it’s the truth. Now she wants me to go on birth control Edit: a lot of people have asked in the comments how I feel about birth control: I have done a lot of research on it and I feel that I don’t want to put my body through the side effects of it. I’m just just concerned about the side effects and how it will effect me in the long term