Based on the description, I would personally opine that it was a venial sin, but the ultimate decision would obviously be with a priest. In the meantime, if you can't get to Confession before your next opportunity to receive Holy Communion, you do have to make a judgment call. If you tend to be scruplous, your Confessor may have in the past told you to not refrain from Holy Communion unless you were SURE (could swear to him) that you committed a mortal sin. If you tend to be lax (doesn't sound like it at all given that you're asking and concerned), your Confessor may advise you to judge in favor of having committed a mortal sin if there's doubt.
Basically, what you're describing is a doubtful conscience, and a scrupulous person or sensitive person (well balanced) might resolve the doubt one way, and a lax person the other way. Given that you care and are asking, you are either scrupulous or have a sensitive conscience. And I suscpect that you did not at any time clearly and deliberately do something that you knew to be a mortal sin, especially given the fact that you were taking some steps to mitigate the possibility of grave sin, e.g. by "covering the immodest part". I would personally put this in the category of a venial sin of "impure curiosity", similar to a temptation, but with some cooperation on your part, even if it was in a confused and unclear manner, thus the venial sin aspect.
Of course, this is my personal opinion and I defer to your confessor. If I had been in the same situation, given past advice from my Confessor, I would make an act of contrition, resolve to avoid the occasion of sin going forward, and not refrain from Holy Communion, having judged it a venial sin.
Topic: Was this a mortal sin? (Read 937 times)