Custody hearing tomorrow, need advice.?

Ok, I was served my summons papers on Friday night at 7:30 p.m. and the trial for temporary custody was set for the following Monday at 2 in the town where the father lives, which is 3 hours away. The father was absent for the first year, when I took him to court for child support. I was still in high school and needed the help to make it. After that he started seeing the baby more often. Then when I went to college him, his fiance, and his parents all moved into a house near the town where I was attending college. I was having a tough time managing the tough university and work and the baby, so I moved to my current location with my fiance. I am taking online cles and i stay at home with the baby all day. The father and I worked out a deal between the two of us where we each spent a week with the baby. I only did this to be agreeable and decent, because I wanted the baby to have his father in his life. Now he has unexpectedly sued me for full custody of our 1 and 1/2 year old son. He wants me to only have weekend visitation and for me to pay child support to him. The only thing I am worried about is the fact that I have a misdemeanor charge on my record. But the father also has a minor in possession charge on his record. Can anyone give me some insight into what the outcome will be. The father has a lawyer, but I do not, because I didn't have sufficient time to obtain one.