could i be pregnant ?

Sex on the 5th day of your cycle will be unlikely to cause pregnancy unless you have very short cycles (like 24 days or shorter).

Pre-ejaculate is a fluid that ooze from the penis when the man gets excited. Much like your arousal fluid, there are not copious amounts of it and it does not get ejaculated. From the way you are describing it it sounds like he actually ejaculated inside you.

Wait until your period is due and use an early detection pregnancy test. If it is negative you have to repeat the test 7 days later. And get some condoms while you are at it, unless you want to be mommy garcia.

Best of luck!