I'm 13. How do I tell my mother about my boyfriend? Jan Here’s the thing. You could just tell your mom you are pregnant. Then after she is all pissed off tell her you were just joking and that you have a boyfriend. She will be soooo relieved that the fact that you have a boyfriend will be no big deal. Also ask her how to use condoms so you don't actually get pregnant. That way in the future there will be much less uncomfortable conversations between the two of you.