The main irresponsability i see here is having sex without taking any precautions.
Besides, it smells kinda fishy a 15 y old girl having sex with a 12 y old boy and got pregnant at the 1st time. Do hope that DNS tests clarify this matter.

Only God Can Judge Me
الله فقط يمكنه محاكمتي

I am you and you are me, if you love i love, if you suffer i suffer
أنا أنت, و أنت أنا, إذا أحببت نفسك أحببت نفسي, إذا عانيتَ عانيتُ