Was your brew a kit? If it was your OG is what was specified by the recipe as long as your volumes were correct. If not a kit don't worry. OG is only useful for estimating ABV. A hydrometer reading after fermentation has begun will only give you a ball park OG. Not worth the risk of infection.
https://www.homebrewtalk.com/f163/forgot-take-hydrometer-reading-before-fermentation-433590/
If it tastes good after bottle conditioning your brew was a success.
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