The question wasn’t about receiving knowingly, but rather unknowingly. For example, sometimes those of us who suffer from scruples tend to not be sure of what state we are in, at least this is the case for me.
I wasn’t targeting you. That is why I emphasized “intentional.” I understand scrupulosity because sometimes I am not sure where I may be, but when I am very concerned that it may be “grave” and mortal. I try to get to confession and just ask Father and he will usually tell me. If he says nothing, which is more often the case, I take it as I am fine with the absolution. My point is that if we really believe that it may be truly a mortal sin because of knowingly doing something, it is grave, etc., then I will not take Holy Communion so I am not committing another mortal sin by taking Communion with the possibility of having a mortal sin that has not been absolved by a Confessor. In no way, am I suggesting you are in a state of mortal sin. I am just saying, personally, when in doubt, I wait and go to confession to be sure.
Venial sins can appear to be mortal sins, but fail to meet each of the three conditions for mortal sin. If a sin is grave in nature, but the person did not have full consent or sufficient knowledge that what they were doing was sinful then it would be considered a venial sin.
All three of these conditions must be met otherwise the sin is considered a venial sin.
:black_medium_small_square:Grave matter.
:black_medium_small_square:Sufficiently full knowledge.
:black_medium_small_square:Full consent or freedom.
Grave matter means that the sin must be of substantial significance.
Sufficiently full knowledge means that one must fully know that the sin they are committing is serious and have the intention of breaking the relationship with God.
Full consent or freedom means that the person must fully and willingly commit the sin.
Hope this helps with scrupulosity issues in determining if it is Venial or Mortal, but when in doubt I always take it to my Confessor. God Bless you for being diligent about your relationship with our Lord.