Blood test results

So I got my blood drawn from my primary care physician last Monday. I got a message today that at the time I got my blood drawn that it showed I was 8 weeks pregnant. Making me 9 weeks pregnant now. But I had a period — going through 3 pads a day period — from April 5th until April 8th or so. Should I trust last period or should I trust what the doctor says? My first ultrasound is June 4th and I’d almost be out of the first trimester according to my PCP. But all my apps put me at 6 weeks.