My mom is pregnant and

My mom texted me this morning telling me she is pregnant (I live away for school). She's only 38 and got married in 2013 to my stepdad. My mom has 2 kids already but my steps dad none so it makes sense I guess. BUT little does my mom know.. I'm pregnant too. I'm 19 and my SO is 24. I haven't told my mom yet though ... I feel like it's going to be really awkward as she said a long time ago that better not ever happen. My child and my sibling will be the same age.