Hello Good Evening,
If your period is in about 5 days then can not say anything right now.
You did sex around 19th day of your cycle and there is a possibility to conceive, but cant not say anything till your due date is over.
Whenever you cross your due date by 3-5 days, then only you should go for a pregnancy
test, which depends on a HCG
level in urine, and increase its level day by day.
So if it will overdue for about 3-5 days then go for a pregnancy test, if you find weak positive or inconclusive result, then repeat the test in next 2-3 days, it will convert to positive or your period will come, and you will be able to identify that you are pregnant or not.
Dr. Naresh Jain.