I had implantation bleeding with both my DDs. With DD1 its was at 10dpo and was light brown mixed with CM and lasted less than a day. However with DD2 it happened at 9dpo and was bright red, as heavy as a period and lasted 4 days! I actually thought it was my period, but (this may be tmi) my period usually starts brown then turns dark red and finishes brown, but this bleeding was all bright red. When the test was positive I was sure it must be a chemical pregnancy, but my DD2 proves me wrong! xx