Precum and pregnancy

I’m taking the mini pill and wear condoms (which have spermicide on them) during sex every time. But I am just a little nervous about precum. Sometimes during sex, the condom will slide down a little ways and expose the shaft that was covered before (which would have precum on it I’m assuming) and I’m worried that when the peen goes back in that precum gets in there.. I know this may be stupid but it’s just one of those things I get anxiety about. What is the chance of getting pregnant from that?