I think my app may be wrong as I just looked online and it says 12-14 days before period (average) is this right? This puts my O on the 22nd not the 19th like my app says but my period always arrives when my app says it does. I also got the CM 20-21-22 and tender boobs yesterday & today. Not exactly worrying but OH and I DTD last night & now I'm a bit like hmmm what if I ovulated on the 22nd after all. no biggie as we'll be trying soon anyway but getting my head around ovulation is driving me mad!