pinkish color menstrual cycle

i had uprotected sex on the 31st of July.on the 7th of August I came on my cycle however,the first day very ,very small spotting and it was brownish it was not a regular flow.then on Sat.it was very,very light flow almost like spotting.this went on for 1 hr. then no more spotting or bleeding until Sunday which I completly soaked 1 full pad for the whole day.then on today Monday same scenario,light spotting stops for a few hours then comes again not heavy at all I used only 1 pad today and its not soaked at all just spotting again.what is this my cycle has been the color of a light pinkish.