My husband and I just started TTC this month. I purchased clear blue advanced OPKs and I began testing at the beginning of my fertile window according to the app. The last 4 days I've tested and I haven't gotten any LH surge it just says low. Now on the app it keeps moving my fertile window and period start date back. I've had some spotting during the window for a couple days felt nauseous today and yesterday with sore breasts. I have regular periods, very rarely am I late or early. Since January they have gotten a little longer but mostly due to days of spotting before hand. I feel like something is wrong that I haven't gotten any high fertility with these tests!!