I did a ovulation calculation online, typed in first day of my last period which was August 19th and 40 day cycle, it said I'd be most fertile on 11th-16th of September. I started bleeding on the 14th of this month so I realise it can not be implantation bleeding ? as I believe due to the calculations I ovulate on cd 23. So this random bleeding that I had on 14th 15th and 16th can not be ib ? but I'm very sure it wasn't my period as not suppose to if started till 28th usually lasts 5 days or so and I sure know when it's coming , so 
any reason why I was bleeding?
any reason why I was bleeding?
