How far pregnant am I(weeks)

Chantellerathmill

So basically I didn't have sex before my ovulation, my ovulate was on the 10th march, and on the 10th march is when I had intercourse. I know I ovulated on the 10th march because I did an ovulation test, I got positive pregnancy tests, so I'm pregnant I for a bfp on the 20th march, it's now the 28th march so how many weeks pregnant am I? If I ovulated on the 10th march. And only had sex on that day?