I just gave birth to my daughter 6 weeks ago and after 2 weeks of...

I just gave birth to my daughter 6 weeks ago and after 2 weeks of giving birth, I put in the NR, which was the first birth control I've ever used. I went to the doctor yester for my 6 week checkup and my thyroid is swollen to the size of an egg. He suggested getting an ultrasound and bloodwork done to check it out and I will be going this week but I was just wondering if the NR could contribute to this swelling since they're both hormone related. I have other symptoms but I thought it could be because I just had a baby: constipation, diarrhea, I felt like I had the flu and it turned out to be an upper respiratory infection, tired, severely dehydrated one day to the point of extreme body aches and pain, congestion, and of course the swollen thyroid now. After reading this site I'm worried I should take it out but I don't want to get pregnant again and it's hard for me to take pills religiously everyday. I thought this was an easy solution to that. I just put in my second ring 2 days ago. We'll see what my results are from the thyroid testing.