I didn't have it with my first, but I had it with my current pregnancy. I had the classic signs of it. It started with light spotting the evening of 8 dpo and then it stopped by early afternoon the next day. Then I had some heavier spotting at 10 dpo that only lasted a couple of hours. After that the spotting stopped completely and I haven't had any since. I have never spotted in my life unless it was after a medical procedure, so I thought maybe my period was coming super early or something.
I did find out at 9 weeks that I had a subchorionic hematoma. I'm thinking it was related somehow to the spotting I had. I did not have sch with my first pregnancy.