We had sex 3 days priors yo indicated ovulation and day of. My cycle isn't supposed to start until Sept 6 and is usually on time. On Sept 3rd I experienced bright red spotting for a min then what was like a heavier spill but nothing more than a liner and then disappeared for the rest of the day. On Sept 4, (today) no bright red blood only a small amount of light brown discharge. Breast are extremely tender even just resting, no extreme nausea just specific foods sound gross, some abdominal pain, random hot moments and occasional dizzy feelings. Could this be implantation or period? Is it too early to test?