Receiving oral sex from that lady never exposed you to HIV, the same as licking her vagina. HIV is not able to infect once it has been exposed to air or saliva. But oral sex can expose you to other STDs. Check the STDs forum to get information about that.
The vaginal intercourse was protected, which means you didn't have any risk. Condom do their job.
Today I am having difficulty in swallowing. Is this a symptom of HIV
I hope what ever you are saying is correct?
Can this be tested at day 21 with conclusive results?