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. 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?