Husband is away for training and this happens..

So my husband left a week ago for training and after 8 months of TTC, (miscarriage in November) we have a pretty dark positive. He comes home in 3 weeks, so I was hoping to get some ideas on how to surprise him?! Idk if I'll be able to keep it secret for that long but I'd like to include our son in the surprise when my husband gets home! I'm so excited, I really hope this one sticks!! 🙌🏽😍