On Clomid.. Implantation Bleeding?

This question is for those who have experienced implantation bleeding or who have taken clomid. I normally have a pretty long cycle (35-40 days) and on a good cycle around 32 days. I took clomid on cycle days 5-9 and made sure that be BD'd on all of the right days. I am now on cycle day 27 and have been experiencing sore BB's (not anything worse than AF pain). I have also felt bloated and uncomfortable lately. Then yesterday (CD26) I noticed twice that I had CM that was streaked with light pink blood. I checked again last night and this morning and it did not happen again. I took an off brand HPT today that said it was accurate from the day of your missed period and it was negative. What do you think? Anyone ever been through this?