Short term disability

So I work full time 40 hours a week and I have been at my job for two years. I'm currently 22 weeks pregnant and had recently started working a part time job for about 15 hours a week as well. When it comes to me going on disability I definitely want to take the 4 weeks before and I'd get 8 weeks after due to csection. I wouldn't be able to handle and I wouldn't want to work that many hours a week after my baby is born. But I guess my question is after I healed from surgery can I go back to working my part time job just maybe less hours for them and still get to collect for my other job? Or go off from the one job and just work like 8 hours a week up til the csection. Because I really don't want to be working that much and I don't think I could handle it!