I felt like I was going to mess everything up too (I still do sometimes at 26 weeks) and I followed my heart rather than my brain and kept the child. It is pretty miraculous how everything turned out for you. Just tell him the same way you told him the first time and you took precautions to prevent it so he should understand. It will all work out, you can include him by talking about it, going appointments together, preparing for it together, good luck