period or implantation bleeding

Tiffany

I ovulates on DEC 29th. glow has my periods at average of 27 days, which according to glow AF should have started Jan 14th. my periods are usually 30 days apart so I should have started Jan 17th. after bd Jan 12th I woke up early Jan 13 bleeding it was very light but it was bright red. them Jan 14th it got heavier and has some mild cramps

then today Jan 15 I only have blood when I wipe its light pink. could it be implantation bleeding or what?