The idea of the Eucharistic fast is that the fast causes us to focus on what we are about to receive at Mass.
When we eat food, we are eating either for the purpose of satisfying our bodily hunger, or for the purpose satisfying an urge for pleasure of the palate and a full stomach.
When we fast, we are forgoing that pleasure so that we can recognize and focus on – not our food hungers and pleasures – but on Jesus Christ who can fill the longing of our soul in a way that no food can ever satisfy the hunger of our body.
Swallowing a food particle from your mouth is a trivial matter that has nothing to do with the whole idea of the Eucharistic fast. So, the answer to your question is, Yes, you may receive Communion.