Hi there, I have understood your concern and I will suggest you the best possible treatment options.
First of all do not panic.
As you might be aware that, for
pregnancy to occur, spillage of semen in and around the vagina must be there. As per your history, there was no spillage of semen, hence chances of pregnancy are almost nil.
If you are having doubt about pregnancy then I will suggest you to get pregnancy test gone at least 20 days after your last sexual activity. You can confirm the pregnancy by checking for
beta HCG hormone levels in the morning's first sample of urine or in the
blood test. Still you have any doubt then USG will be of help.
Secondly, as you might be knowing that in a woman with regular cycle, day 10 to 20 of the cycle is the most fertile period of the cycle. If you happen to have unprotected sex activity in this period, then only there is chance to get pregnant.
I will suggest you to get proper sex counseling done, about safe and protected sex activity, this will help to prevent unwanted pregnancy and STDs.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar