I had a d&c performed last Thursday as I was diagnosed with a blighted ovum I was told not to have sex until 2 weeks later but I ignored the warning and had sex 2 days later could I have gotten pregnant already?

No, as the lining of your uterus would not have had time to prepare to support a pregnancy.

Are you still having any bleeding or spotting? If so, best to hold off on the sex so that your body can heal.