Would you recommend this app to young girls?

Would you recommend this app to young girls to track their period. I'm 13 and I'm really shocked with all the sexual posts on here. I hadn't realized it was like that and I like using it to track my period but if my mom sees this, she'll be very mad at me. I know I can leave and I think I'm going to find a new app. I'm just wondering if you would recommend this to someone so young. My cousin told me to download it. She's 23.