I have, and its been way stressful. I didn't have any spotting the first seven weeks other than implantation bleeding at the very start (mistook that bleeding for a super light period due to new, apparently super ineffective, birth control pills). Then I had some brown spotting that I thought was going to be a miscarriage in my eighth week. It stopped, and returned about a week later. I had an ultrasound that showed everything was normal.
I have had brown spotting off and on, but one morning during my 12th week I woke up to fairly heavy pinkish-red-brown blood. It actually was enough to require I wear a pad. Before it was on TP only. I headed to the hospital but my midwife called while I was on the way, so i went to her office instead and she found the heartbeat with a doppler and made me an appointment with a specialist. Because it was a holiday week they were really full and I had a long wait. Three days before I went to the specialist, I awoke in the middle of the night having to pee. I made it about halfway across my bedroom before I felt warmth running all down my legs and feet. I actually said aloud, "what the fuck?" and turned on the bathroom light to find myself covered in bright red/pink blood. At least a cup of it. I was sure that was it, I didn't want to wake my boyfriend up and tried to clean myself up as best I could. It took me a while to even remember what to do (where I keep the towels, how to operate the shower). I just stood there in shock. Finally cleaned myself up and went to lay on the couch, and try to figure out what to do because I had orientation for a new job that morning and I felt sure this was a miscarriage.
I skipped out on orientation, went back to my midwife, and she found a heartbeat right away. I was amazed, although I should add here I had no cramping and there were no clots (at first, as it slowed down it began to clot) so I wasn't sure what was going on except I had lost a lot of blood.
I was sure I had a subchorionic hemorrhage, but the specialist saw no evidence of it. I am not convinced it wasn't one though, and perhaps it bled out, or he overlooked it because it was the 5th of July, and already way past 5:30 when I was even taken in and he saw me all of two minutes and 41 seconds! Either way, I have no definite explanation for this bleeding, but I pretty much live in terror of it happening again.
Right now I'm 16w3d and haven't had any bleeding for about a week, but I pretty much expect it will return. Honestly, this bleeding has kept me from bonding with this baby because even though everything has been okay so far, there is a part of me going, whats the point? :( It's rough.