Chart help! How many days DPO?

Question

So I started using the Clearblue ovulation tests on the 1st March and I got a solid smiley on the very first day which must mean my LH surge was detected. This could mean I ovulated that day or the day after. I just want a definitive answer as I use Glow chart and FF chart, the FF one seems earlier to read however it says I ovulated on the 3rd when I would probably say I did on the 2nd? Please advise :)

Answer

I find that Glow bases DPO more on the outcomes of OPKs where FF goes more off of BBT. There is an option in FF to change the major determining setting to OPK but it defaults to BBT. 
Regardless of my temps, Glow always says I ovulate the day after my positive OPK. I trust FF more because BBT is more definitive for me.

Chart help! How many days DPO?

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