So my boyfriend fingered me..

...and I barely even felt it? 
This isn't the first time he's fingered me before, and we've had protected sex three times before. 
But this time when he did it I didn't really feel anything besides his finger going in an out of me. I had an orgasm but that's only because I was touching my clit but it felt like that was where the only pleasure was coming from ?? This is the first time anything like this has happened lol sed is usually great and/or satisfying so??