Short cycle nexplanon/implanon?!

So i have been on the contraceptive implant for almost 5 years and had prolonged bleeding throughout... anything from 10weeks of bleeding at a time. We had it removed in april and my periods appear to have come back perfectly to 5 days but i have really short cycles of 17 days.... Could this be temporary fromcoming off BC? Im worried that my luteal phase is too short to even think about TTC.