4 Weeks Pregnant ??

Ok so my last period was on the 27th if october. Its usually 3 days,and my cycle is usually 33 days. I had sex with my ex on the first of November. But I had sex w another guy on the 15 of November even though he used the pull out method, that doesn’t always work right?? . I took a pregnancy tests today and they all came back positive. I calculated my due date online and it says I’m 4 weeks and a day, am I pregnant by my ex or the other guy ? I’m so scared because me and my ex are patching things up and me not being entirely sure about him being the dad while tear it all down. Please help, what do you guys think ? ( yea I have my first doctors appointment coming up but can they tell how far along you are being this early BESIDES calculating from last due date ? ) 😩😩