Im prior service...I was in ACTIVE DUTY ARMY...want to come back in reserve..?

Ok so i was honorably discharged on chapter 8 bak in 2008. i did not fullfill my 4 year contract and was in the service only 18 months. I had to get chapter out on pregnancy chapter because my husband was i iraq so i had no choice since i was facing deployment. i want to reenlist in ARMY RESERVE...i shouldve taken that chance when i had it..but i decided to chapter out completly. i regret it and want to go reserve..anyone knoe the requirements...will i have to do BCT all over again?