Need Urgent Advice

So I'm 22, been in a relationship with my man for 4 year, we have a 2 year old together. Our relationship is bumpy but we always vow to make it work. My Mr is currently involved in a court case and he could go to jail for 7 year max, he may get less he might not even get jail but we expect some jail time. His final date is in December this year. I just found out I'm pregnant. I haven't told him yet as he's sleeping. I don't want to do it alone. Is it wrong to think about abortion? It hurts to consider as I already have a daughter and she would love a baby I know she would. But the stress of the court case, I just don't know what to do. Do I even tell him? sorry for the long post...