My resting heart rate

Hey everyone. I have an app on my phone where I track my heart rate; something I've done for about a year now. Usually my resting heart rate is 55-58bpm, but today was very different. I was feeling extra (unusually) tired and dizzy even while so I took my heart rate and it was 109. About 30 minutes later I took it again and it was still 97.   I waited another 30-40 minutes and it only went down to 95. I know heart rates do increase during pregnancy, but that seems crazy to me. Other than the slight dizziness and fatigue, there are no additional symptoms. Any thoughts on what's going on? Is it something I should call my dr about?  I hate contacting my doctor for every little thing, especially when it's probably nothing...