3rd child, new husband... Freaked out

TTC my 3rd child which would be my husband's first. I have two children from a previous marriage. I think I freaked myself out with all the necessary items that we need to buy all over again. From maternaty to baby items. My husband wants to go all out because this would be his first and wants to have a co-ed baby shower. Would that just be tacky of me to have a second shower? Or to even make a registry?