So i put in my ovulation positive day on my calendar, and it said my period is suppose to show on the 27th. I took ny positive Lh off, and it changed to the 29th. I had this same situation happen to me last month. It throws me off track with my cycles. So i think I'll start putting my Lh positives on another calendar. It can make you feel as you are late for aunt flow, then you expect pregnancy bc she hasn't shown up. Anyone exsperiance this?