Carmen loves her 10 year-old son, but if she could turn back the clock she says she would never have become a mum. "Motherhood has taken my health, my time, my money, my strength, and my body," she says. "The price is too high, and the cost is forever." The teacher, in her 40s, is part of a hidden community of women who regret becoming mothers. This regret is rarely voiced out loud. The women who contacted me would only talk about how they feel on the condition of anonymity, for fear of harsh judgement and because their families don't know. Carmen tentatively put her regret into words on a general parenting forum a few years ago and says while some people were empathetic, others reacted as if she was "a monster". The extreme-pressure and sacrifice that motherhood can involve is put under the spotlight in the film If I Had Legs I'd Kick You, which is up for an Oscar tomorrow night.…