Oh i have been getting a pulsing too & also have an. anteria placenta, wondered what that was! Have read it can also be the baby having hiccups 
Anyone else sometimes feel like they a lying on baby? When i turn onto my side s/he seems to wriggle right underneath where my tummy touches the mattress then kicks the hell out of me as if to say "Oi, get off!"
Munday, sounds like your ergo is the real deal, exciting! I have seen people use teddy bears to practice on so why not a cat? I won't be held responsible for any scratches you may suffer though 