Is this considered incest?

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Hey /adv/ I got a pretty whack story that just happened about a recently. I dont know what to do and I need advice.
>Be me
>Be 19 and in college
>Get job at a park
>Hot office Chick works there
>Im an introvert so the first few weeks were weird to say the least
>Im a feild worker too so i dont talk to her much
>One day I have to go through staff training and I get her snap
>We start dming over that
>Shes actually really cool
>Fast foward about six months
>We hang out every now and then
>One day things get heated during netflex and chill
>one thing leads to another and we smash
>I nut in about three strokes but I still try to please her after
>Whatever I got the puss puss
>We start to low key date after that
>Keep it low key so that work doesnt get weird
>Later that month my mother gets that ancestory.com shit
>Get curious and log on
>Turns out my family used to own a beer company
>Also turns out that my GF is my 3rd cousin
>They fucked off to the west coast in the 20's and changed their last name
>They then moved back to the east coast
>It's been a week and I haven't told her or anyone else
what do I do /adv/? I am not a inbreeding faggot, but is it incest if I didnt know we were related? Should I tell her? I will do whatever a person with the digets 5587 says.