I have a dance concert on both the 29th and the 21st of August and AF is supposed to be coming a few days before. I am irregular and last month (after losing my virginity) <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> told me I was 8 days late (which now has changed to 3 days since I am irregular naturally and have a longer cycle than most girls). I did stress about being pregnant but I realise there is absolutely no way.