What’s the likelihood???

I know you can get pregnant from precum but what’s the likelihood??? I am on bc pills and always take them on time and effectively (no Antibiotics) but I accidentally forgot them in the glove box of my car and I heard heat can effect them and had sex with my SO without a condom...I’m not really worried about STDs or anything because we are in a Committed relationship but like I said I’m just worried about precum ... he did not actually cum in me...I should start my period in like 12 days I am just an over-thinker when it comes to getting pregnant and please no judgement for not wearing a condom...