My husband is leaving.

My husband has been in the military for 6years now. He re enlisted and will do another 6 years. He leaves the first week of September. I’m 21 weeks pregnant and he will not be here for the birth and I’m devastated. He was here for our other daughter but he won’t be for this one and I don’t know how to handle it. It’s so hard and I’m so emotional about it. Any advice/tips for me?