I feel like it really depends on how much distress it causes you? I'm diagnosed with OCD (primarily checking, counting, derma & trich, violent/harm) and I find that, while contamination is not my primary area of obsessions, I have some triggers in that area? Same with a few other areas that don't usually bug me. For example, I'm thrown into repetitive hand washing when I get laundry detergent on my hands because of an excessive fear of chemical burns but contamination is almost a non-issue for me otherwise.

Basically, I feel like this could definitely be related to your OCD because OCD isn't restricted to the areas you usually have your problems in.