If you started your Fard prayer after 4:23, your prayer is valid but your sunnah prayer is not.

I hope you are well. I prayed my fajr salaah the other day at 4.20am in the morning starting with the two sunnah Rakat. I didn’t realise that the time for fajr was actually 4.23am so I prayed earlier than I should. Does my Fardh prayer (which I did after my sunnah) still count?

Prayer | August 27, 2017 9:04 am
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sheikh…usually i pray isha after that 2 raqah sunnah…then 2+1 raqah witr..i go to sleep and wake up for thahajjud about 45 min b4 fajr …pray 2rakah thahajjud prolonging it for 30mins and recite quran upto fajr… am i doing correct or should i need to adjust anything in my witr or thahajjud prayers?