Can an X-ray taken without the protective lead sheath immmediately mean you will contract cancer?

I'm scared because I have a sore neck and throat and don't think I was protected for an X-ray I took a few months back.
Update: I had a dental X-ray a couple of months back and I don't think I had sufficient protection. Now I have symptoms that I relayed to a friend and she knew someone with thyroid cancer with the same symptoms.
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