Implantation bleeding is supposedly experienced by a small percentage of women, like 7%.
Typically, implantation bleeding occurs 7-10 days (avg is 9 days after ovulation and fertilization) after ovulation. Do you ovulate very early in your cycle? I'd be hard pressed to say that bleeding on CD14 in a 26 day cycle is implantation bleeding, based on what you've described so far.
One can have some spotting or bleeding mid-cycle due to:
-Anovulation (unopposed estrogen)
-Low progesterone: Shortened or prolonged corpus luteum life span; abnormal relative ratio of estrogen to progesterone
-Beginning or stopping hormones (e.g. oral contraceptives, progesterone)
-Trauma or injury to the vagina or cervix
-Cancer (vagina, cervix, endometrium, ovary)
-Certain drugs (e.g. anticoagulants)
-After Gyn procedures (HSG, laparoscopy, biopsy, D&C , cervical cauterization)
Hope that helps some.