Weed and birth control?

I've had the skyla IUD since February and my body became pretty adjusted to it after about two months but as of more recently I have been having so many issues similar to what I had when I first started my birth control. Things started to get really bad right after my birthday at the end of June. I had a lot of other things going on at the same time however. My best friend started working at a summer camp so I couldn't see her anymore, I had just graduated high school, I had started a new full time job, I started playing for a new team, and I had just been dumped. Then in early July I had started smoking weed (please I don't want to get political) and I have had non stop bleeding and occasionally I'll get awful cramps that would effect my work and sex hurt. Any advice or opinions are really appreciated even if you have no experience or anything.

TLDR: is it more likely that any changes to my body and my birth control are due to smoking or to stress?