Pull out Method

I had unprotected sex with my SO in a moment of stupidity. We usually use condoms but had none, he pulled out way before he ejaculated and my period is due in 3 days so I’m a week and a half away from my fertile window. Do I need plan B? Considering even if any sperm from precum got inside it can only live for 5 days? I’m planning to get the coil this week so won’t have to panic like this again.