Im sure it's just ovulation discharge. Usually happens in the middle of your cycle.
If you didnt use a condom and he didnt *** inside you, its about a 20-25% chance. And its way to soon for you to even know if you are pregnant or not. You wouldnt be having any symptoms of it for another 3-4 weeks anyways. You could have contracted an STD/STI and that would cause milky discharge and those symptoms would show up right away.