Newly off IUD & confused about ovulation day

Hi! I am new to this but I am worrying myself to death researching my ovulation. I had the Mirena IUD for 4 years (September 2015-October 1, 209.....no periods during those years, just symptoms). I took it out October 1 bc I wanted a break for my body and wanted to conceive next year. I haven’t gotten a period or anything yet. Some websites say your period resumes how it was and with my last pregnancy I conceived October 11. I had sex this weekend October 12 and 13. Is there a chance I’ll be pregnant or am I psyching myself out because I got pregnant around this time during my first pregnancy? Any advice is appreciated!! Thanks!