Your question was fully answered in this and your previous thread.
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Just saw in the first part of your question that she “forced” you to have sex. Yah right. If you went and got a plastic bag and put it on your penis and chose to engage in the sex she did not force you. If I was you I would be more concerned of putting a dirty bag you found outside her house on your penis and even more for her having it inside her. That is not a risk of hiv but can be a risk of infections from whatever was on that bag ie feces dirt food etc... please just carry condoms if you believe you are going to have sex
I am trying to understand your question but from what I gather you are concerned the bag had blood on it before you had sex and when you put it on your penis you pushed you blood from the bag into your urethra. Correct? If this is your exposure then it was not one because A) the chances the blood was infected with hiv is astoundingly low and B) any virus in the blood would be long unable to infect. A plastic bag is not a good condom at all. It is prone to tears and because it is not designed for sex can allow the exchange of body fluids because it is so large. Please buy condoms. This was a no risk exposure and I am almost certain you have posted this question before and received the same answer. Move on