<human>: Backstory: I come from a pretty religious home. I have one sister, who doesn't id with any religion, specifically. She is a VERY private person and doesn't really tell us much about her feelings/ boyfriend/ personal stances. My parents raised us to follow rules of no underage drinking, no sex before marriage, etc. This comes into play later.

So, a few days ago I was helping my sister find her phone. She was out of the house, and was making sure she left it at home. (called me from another phone) I found it, and saw she had a few messages on it. I assumed these to be from her texting her phone to find it, so i opened her phone to reply. 

The phone opened upon messages of her and her boyfriend, and long story short, they implied that they have been having sex. 

I realize it's her body, her relationship, and probably NONE of my business to have snooped and found this out. But I love my sister, and I have a few concerns. One of them being, I feel like my mother should know about this. My mom has always told us if we ever did decide to do anything like this, to come to her. My mom is super supportive and loves us both dearly. Also, my sister is still living in their house, so I feel like their rules also still apply. 

I know my mom would want my sister to be safe, and would want to know about this. I am a bit torn. I love my sister very much and really want to let her know that I am here for her if she needs to talk about anything. 

I believe my sister is on BC ( for acne/period related reasons). This is her first and only boyfriend. I just want to make sure she knows the risks and is being safe. How should I approach this to minimize damage in any relationships? Should I just pretend I never saw this?

Summarize the given text in a few sentences.
<bot>: found out sister is having sex with bf, have religious parents. Feel like they should know, but I am torn. help?