Contractions

I'm 19 wks 3 days. Been having contractions off and on for a few weeks at least but nothing major. I also contracted throughout my first pregnancy so I wasn't worried. But the last couple days they have been more intense. I think I might be just dehydrated so I'm drinking lots of water but it's hard for me to sit and relax since I'm a nanny for 2 four month olds and one of them almost always needs something. Suggestions?