Ovulation, Precum & Sex

I had sex twice today, but we used condoms. The partner that I had sex with thrusted a few strokes raw before putting the condom on, but I'm on ovulation week. My cycle is always predicted accurately by eve (period comes on the day predicted by eve)

I'm worried that I'll get pregnant from this, and I'm 18 days into my cycle, with 2 more fertile days left.

His penis is wiped dry, and I made sure theres no visible fluid on his tip before inserting it for a few strokes.

Am I overworrying? I'm not sure if such method works.