My 14 year old sister read the sexts I sent my boyfriend?

Okay, so recently I was just sexting my boyfriend and also sent him some nude pics of mine (One of them being of my.. ahem ahem!), I usually delete such conversations but this I forgot to do so. And accidently I left my phone unlocked when I went to the bathroom.. So my sister reads all the recent messages (I hadn't even told her about the fact that I had a boyfriend, i was going to tell her, but I definitely hadn't planned she'd find out this way! ) I am sooo embarassed! Should I talk to her about the pics (That I only sent them to a guy because I trust him and love him, and that I dont want you to do any such thing for now) or should I just pretend like it never happened (She hasn't mentioned the pics even once, she just said stuff me not telling her about my bf and that she already had a clue etc etc..)? What should I do? Its been a day now since she found out.. I get so uneasy whenever I think about her going through the conversation (It was really explicit) and the naked pictures of mine..! I am 16 btw.. and a virgin
Updates
+1 y
And I trust my boyfriend, he always deletes the pics after seeing them
Updates
+1 y
She hasn't mentioned the pictures even once!
recently she did something horrible, and I used to black mail her for that,
but now she keeps saying just one thing "HAHA you can't blackmail me anymore!)
My 14 year old sister read the sexts I sent my boyfriend?
Post Opinion