Contraction timer app?

33 weeks but baby is measuring 4 weeks ahead and 99.7 percentile. Had my first at 35 weeks bc my water broke and my second at 37 weeks. Induced bc of high bp but was in labor when I checked in for induction. I've been having contractions all day and they seem to be getting consistent. Getting a little nervous. I'm home alone with my two kids and live an hour from anyone that could watch them and the hospital. Anyone know of a good contraction timer app?