Back pain

Christina • 20 year old married Mommy of 2 healthy active boys ages 2 & 4 & expecting baby on November 25th 2015 :)
I'm 20 weeks & 4 days I've been experiencing back pain the last couple days it's not terrible but I have 2 toddler boys at home that I chase around all day (ages 4 & 2) I have tried Tylenol & a heating pad as my doctor suggested & it seemed to make it worse. When I went & got my U/S they said my princess is pushed back & using the placenta as a pillow. The pain hurts when I stand up or bend over. What else might help alleviate the pain even if it's temporary. I have a broken tailbone & no curve in my L spine so sometimes the nerves get pinched but this doesn't feel like that not are the exercises from my list from physical therapy help