Idk why this is happening

So lately I notice my leg.... just one of my legs are trembling/shaking after I have sex. NOT during but after. Like today I left my boyfriend house and as i was driving home my right legs starting shaking really bad when I step on the gas/brakes (when I apply pressure to my leg to move it so I can drive )

HAS this happen to anyone else I’m sooo confused😫😫😢 I left his house 3/5 mins after the sex

& for anyone wondering I left not bc it wasn’t good... a girl was frustrated and got some D ..

I enjoy sleeping at my own house rather then his