Help! Insight needed!

I took a pregnancy test this morning 9/5. It was positive. This really is unexpected. My question is, my first day of last period was 8/3. I visited my bf 8/25-8/30. Its only maybe 10 days ago. Is it really possible to be pregnant and have a test be positive that soon? Has this happened to anyone? Glow predicted my ovulation 18-23.