weed vs the pill

i’m under 18 and my mom is planning on taking me to see a gyno to get me on birth control. i’m not sexually active but my period is very irregular and my mom thinks it’s a good idea with me growing up and all. im obviously going to go in by myself, but will the doctor ask me if i smoke? do i need to tell her yes, but not cigarettes? i’m a regular marijuana user and i don’t want it to interfere with my birth control in any way as i’ve found no information on its effects online. she also cannot tell my mom, is that correct? not sure if it makes a difference, but i live in new york state.