not understanding myself right now...

I had a very very very light period from the 27th of April - May 1st and my period was not supposed to come until the 27th according to Glow! well yesterday I was spotting a little i thought maybe it's implantation bleeding. well today I am bleeding more so I guess I'm on my period SUPER early from last period. I had nexplanon from March - December of 2017 and i have been ttc for 6 months now. everything seemed back to normal until today and I'm so stressed ANYBODY CAN RELATE AFTER NEXPLANON???