Business trips or military services can occur, and while this may cause an awkward situation it is important to look at the positives! If they will be coming back in the following weeks, you can opt for waiting till they return to tell them the news. If they are going away for a longer duration, or just left, you can break the news through a video call, and wait for their arrival to celebrate the amazing news. There is no going right or wrong time in this situation, therefore as long as they find out from you and not when you’re far along; it will be a beautiful moment! But remember that every person’s opinions vary, and each relationship and situation is different and this is a delicate matter.