My baby's dad is in jail...

He is in jail and he hasn't called or emailed me in like 1 month. I'm 6 months pregnant with his baby. He said the last time we called that he wasn't going to drop me and our baby boy. I feel like that's exactly what he has done. But ik that he could be in the hole. I've emailed him 4 times and I always send a stamp that way he can email me back. I just feel so lost rn...