That's kind of similar to what happend to me about 3 weeks ago. I woke up at about 4am and went to the toilet, never put light on and wiped n noticed that the paper was darker than should be, so jumped up and put light on. On putting the light on I noticed there was fresh red blood on the paper, so i looked in the toilet to see if it was just on the paper but it was just red in the toilet like I hadnt urinated !! I shouted my OH to come through and he came through and seen it, asked if there was any clots n I said no. He calmed me down n told me to put a pad on n come back to bed n see how things go. I eventually calmed down enough to fall asleep n got up in morning and there hadnt been anymore blood and wasnt any when i went to the toilet later that day. Went up to maternity unit and they listened to heartbeat and done a scan n everything was fine with baby but they discovered my placenta is lying low and over the cervix which might have caused the bleed but they dont know that for deffinate. A couple of weeks later I started having, what I can only describe as old blood started coming out after intercourse but lasted 3 days. I went back to maternity unit and they took a urine sample and a swab and told me to be carefull n take things easy n relax. Urine came back fine but still waiting for swab!
