Starting birth control

Faith
So I really want to start birth control, and I was planning to go soon to my GYN but I just realized my period was about to start, but I really want to go to to my GYN and get the process started. I would prefer getting the IUD, between Mirena and Skyla but have had better feedback with Mirena. Is it still okay to go even if I'm on my period? I also haven't had an official check up with my GYN, I imagine I would need that first. Anxious, advice is greatly appreciated!! 
P.s. - I haven't ruled out the pill, but when I've been on medication before, I've sometimes forgotten to take the pill on time. That's why I prefer the IUD.

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