D.R.
Hi H.,
Meetup.com has a Carlsbad Mom's & Tot's playgroup that you could join. Or you could contact The Parent Connection through Scripps Hospital and they can put you in touch w/ a playgroup in your area. Also there are a few MOPS(Mother's of Preschooler's) in this area.
I found my playgroup by meeting other Mom's in Mommy & Me Classes. Your Yoga classes sound fun.
Good luck to you~D.