I was just walking from the shops and back with my mum, and I was 3 quarters of the way home and I felt the ground shake

I live in the countryside… there aren’t many big vans or lorries around and the nearest quarry is near Steyning, several miles away, and I’m not sure if it’s as active as it used to be. My only guess is an earthquake, but I did feel a bit light headed after so, maybe it was just lack of Something or other.
Bit nervous…