I had unprotected sex but dnt want to be pregnant!!! Period due 3rd?

[princess]

I have just got back to uni and had unprotected sex with some guy I met last night i.e 22/23 september. My period is due on 3rd November and I'm usually about 1-3 days late (never on time). Would I be right in saying I can relax knowing I have had sex when I'm not ovulating? I really dnt wanna be pregnant but dnt agree with abortion so a bit worried. Just want some re-assurance. Thanks x