Implant advice?

Sky • Since 1999, in a healthy and happy relationship of 4 months and obsessed with animals!
So I had the bar inserted on the 12th of December, but I had it put in half way through my cycle, after my period had ended. And then that evening I had like. Little mini period, involving tiny cramps and small amount of blood flow and it only lasted that day.
Now my period is 5 days late if I count it from my regular cycle. Although yesterday again, there was a small amount of blood. I've had very small amounts of cramping over the last week or so, and I am just wondering I all this is normal! Also, should I count my cycle from th day I had it inserted now? Thanks