Period after BC

Sa
I'll make it short. 
Went off BC 4/22 after finishing the pack. Had my withdrawal bleed 4/26. Started TTC 4/30. Got my first natural period after 12 years on 5/25. 
5/25 and 5/26 were medium/heavy. Yesterday 5/27 was incredibly light and today there's nothing. Which just seems very odd to me. My periods way back when used to be 7 days long and very heavy. 
Probably nothing but curious what you ladies thought.