I guess it depends on your relationship hun, I would be telling my mum (and did as soon as I knew each time ) because even if I mc'd I would be telling mum about it regardless. If I had mc'd and they didn't know I was pg they would hear about it anyway iykwim. If you think that you wouldn't tell the about another mc then it might be different I guess, so you might be able to say you are planning on having a holiday or something I guess?