We're pretty sure she is at this point, but it's still too early to tell. She is definatly acting like it. We find that pregnant dogs really do act "contented." She certainly is just that. She's very relaxed, sleeping on the couch as we speak. Also her nipples are getting larger, which she doesn't do when she goes through a heat. May just be coincedence, but they had several natural breedings so it's very likely she is.