Help pls

Ive had sex on the 6th and 7th of this month. Which both days were on my ovulation days. I am now due for my period in 2 days. In the past week I’ve done 3 test and all came back negative. What are the chances of me getting pregnant? I need to know. If I do get my period in a few days I need to know if it’s me or the guy? The whole reason I’m not pregnant!????