Uh oh i don't know whats to do help?

when my mum was 14 she got pregnant with me and I was born in switzaland as her parents moved to there from the USA (they are originally swiss), they moved back soon after, by my grandparents looked after me and my mum left for a long time to do something else, anyways she came back when I turned 16, point is there was an instant attraction, she always hugged me and rubbed my arms and I found my self getting erections as she is really beautiful, one day about a 6 months later I told my mum I thought I fancied her and it was weird and that everytime I touched her I got an ercection, she said it was fine and that she loved me too, anyway one night before I went to bed I went to her room and she was hugging me and telling how much she loved me, she asked if I had an erection and I did so I said yes she took me to bed and basically gave me oral sex, then she kissed me and said I should go to bed. four weeks later I sat on my mums bed talking and we endede up having sex. this is not normal I know, but I didn;t grow up with my mum and heard nothing for 16 years and then I have sex. she is really beautiful and 31. what should I do?