My period cycle ranges from 30 to 35 days. For the last two months, it was 31 and 32 days. This month, my period was due on 17th August. My expected ovulation was between 2nd and 5th August. However, during that time, I had a cold and a mild fever from 1st to 4th August and took medication for the fever for only one day. I had unprotected sex on 11th and 12th August. We always use the withdrawal method, and this time I'm not sure if a drop went inside. On 14th or 15th August, I noticed two tiny spots in my underwear, but I'm not sure if it was spotting or anything else. Since 16th August, I have been experiencing cramps and sore breasts, similar to what I usually have during my period. There are no other symptoms so far. I am stressed out. Is there any chance that i could be pregnant? Does cold and fever delay ovulation?

Thank you