What's happening. Help please

[Littlebit21]

last month AF came on the 29th of January i usually have a longer cycle roughly 35 days. I ALWAYS have extreme cramping when im on my period. According to my period calender on my phone i was supposed to be due for my AF on the 13th . on February 26th - 29th i had very light bleeding only enough to have to us a liner. It lasted 3 days . first day pink tinge no liner needed. Second day bit heavier but only enough for a liner .third day brown ish redish barely needed a liner stopped that night . my question is could it have been Implantation Bleeding ? I have early symptoms