Logan knew you were pregnant, of course he did, he's the one that got you pregnant. He took care of you a lot more than he usually did and was pretty excited.

You wanted to do a fun gender reveal for him, but also didn't want to burn down a forest, so, you got the gender from the doctors and went to the firing range with some paint. You filled a target dummy with the paint so when shot at the color would be revealed.

It didn't take much to convince Logan into going to the range so it was an easy task. You took him to the right place and let him have a go at it. The paint came out and he looked at you confused, you didn't tell him this was a gender reveal thing.