D&C and pregnant 16 days later

Chelsea
Hi all. I took miso awhile back and it didn't work. Had a D&C a week and a half later(5/23). My hubby and I had sex 5/29. I took a pregnancy test on 6/6 as my doctor directed me to and it was very faint. I took another one today( same brand,same time of day) and the test is much darker. Could I be pregnant this fast? If not why would the test be getting darker?