I have an 18 month old DD who lately has been waking 3-4 times in the night, and the only thing that gets her back to sleep is for I or DH to rub her back for 10-15 minutes. If we leave before she falls back asleep she will scream. Its exhausting and I need some help, especially because I'm 7 weeks pregnant and can't be getting up every few hours in the night. We have tried leaving her to cry which doesn't work at all, she just gets more hysterical. The times she wakes are also different every night, so we know its not a specific pattern. Any advice??