its your baby and your baby shower, so do what you want.
however in saying that i do like Trish's advice of sending rsvp's to your mum.
if you want to have partners along that is totally cool as there is "no rule" as such that states you can't have men there .... and we don't live in the dark ages
As one of my friends said when I had my first baby (as i had thing about gifts and ppl feeling obligated to bring them) , she said, its not just about having the baby, its about celebrating being a woman with your friends and sharing. So in the end we have a lovely day out at high tea together (about 10 of us I think it was) and I was so glad she talked me into it.
Lots of luck with the shower!!