Weird Spotting

Ashley
Hello hello! 
So the last two months I've had spotting one week after my period had ended and I figured it was fine. This month it's 2.5 weeks after period and I'm spotting a bit more than usual with some nausea and light cramps. Is this normal? I'm wondering if it's from the sex I had this weekend? I have a Paragard so I doubt I'm preggo at all. 
Anyone else go through this?