The Sex Talk

Angie
So I currently nanny for two teens. The girl is 12 and the boy is 14. I pick them up after school, drive them around, help with homework, and do fun stuff with them. 
The girl is around that age where she will start her period and some of her classmates will start getting curious about sex. 
I know the parents are really the talking type. The mom is extremely reserved and hasn't talked to her daughter. 
So the other day I sat down the girl and talked to her about what it will be like when you get your first period and I also have her the sex talk. I was open and let her ask any question she wanted so she was informed. 
My question is: did I overstep my boundaries? Should I have let her mom do it? 

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