Pregnant from precum?

Hi can I ask something?. My boyfriend and I had a grinding session, both naked, on July 16, that was my 4th or 5th day of cycle or my period. But he didn't ejaculate inside nor near my vagina. And I'm also virgin. And these past months, from december, I have 36, 30, 40, 31, 31 and 37, the days of my cycle until this last July. May I ask, is it possible that I am pregnant? From precum? But my boyfriend last ejaculated 2 days ago before that thing happened and he often urinates.