Spotting??

So this past Monday night I had very very thick stretchy discharge. At that point I was without my bc (mini pills) for a week. And I have been having period like cramps on and off for since Wednesday. I started my bc back on Tuesday when I was able to get them. I now have some spotting but its like barley any coloration. Like kinda really hard to see. I also done the deed last this morning. And last Sunday and Wednesday. I was just wondering if this is like period spotting? Or implantation spotting? I read that you have to give the mini pill 3-5 days to start working? We are really trying as I have a 4 month old and when I had my first I got on the mini pill and I didn't have periods then so what could it be?