Chance of baby coming before 38 weeks?

Unfortunately my husband is being shipped out of state for his job indefinitely. They are going to let him come back for the birth of our son, but how will he know when to come back? I am getting a membrane sweep at 38 weeks and possibly induced at 39. He leaves when I'm barely 36 weeks and I'm terrified baby will come sooner. I have no reason to really believe he will as I have a healthy pregnancy and delivered past 40 weeks last pregnancy, but you never know! This baby is measuring a month ahead. The thought of him not being with me for the birth is really upsetting. I already have to take on the responsibility of a toddler and a full time job right now along with a toddler and a newborn soon, alone. I'm so sad.