Can I get pregnant from precum?

Needing some advice, I started ovulating February 1st till the 5th and me and my boyfriend had unprotected sex 4 times on the 5th and 1 time on the 6th

My period is supposed to come on the 18th usually every month a week before my period I feel nauseous but I don’t feel nauseous I’ve felt a little lightheaded and a headache here and there, my stomach is bloated as well so I don’t know if I should take a pregnancy test or wait until my period is supposed to come.