My steps data has disappeared from the Health app!

Hi – I've been using the Health app on my iPhone 5s to track my steps for a competition. This afternoon, after I had amassed over 7000 steps, my phone ran out of juice. I plugged it back in, checked to make sure my data was still there, and tucked the phone into my waistband to keep recording my activity. When I got back to my desk 15 minutes later, my 7000+ steps had disappeared, and my phone was indicating that I had only taken 182 steps for today. All of my previous data was gone. This was only true for my steps data -- other Health data was still there. Can someone please help me figure out how to restore my data? I recently upgraded to iOS 9.3. Thanks for any help you can provide.