I'm just not understanding..on dec 29 I didn't think I would get a period because my period and <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation app</a> told me I was 13 days late I'm not really sure if I started a period when I was it only lasted 4 days and it was very light please if anyone can give me some advice..please and thank u