i had unprotected sex the 2nd of jan and my period has yet to come. i've had a steady/accurate period with this app for 4 years and never been this late. 3 days ago I had a sharp pain from my lower stomach wrapping around to my back and a little nausea, but that's it. I have been under a lot of stress so not sure if that could be it because i'm always stressed but should i be worried? i know it's too early to test