When would be ovulation be?

[lils2701]

All my apps are telling me different days, so confusing. My first day of last period was 13th August and lasted 4 days. My cycles are 28 days long and very regular. When would you say my ovulation day is?

Ps I'm going to buy some ovulation tests tomorrow, but would still like to know if anyone can work it out. My apps range from 25th to 27th.

I've just realised my title name just doesn't make any sense. Sorry people I'm crap on my phone

Depends when you ovulate in your cycle.

I usually ovulate on day 16 and get my period on day 27.

Your luteal phase (days after ovulation) is a constant so you will get your period a certain amount of days after you ovulate. Mine is 11 days, so if I ovulated on day 13 my period would come on day 24.

Your ovulation date is not a given and can be affected by outside influences.

The only way you can know if you have ovulated is by taking your bbt every day.

Opks only show the surge before ovulation should take place. If you have a positive opk that doesn’t necessarily mean you will ovulate.