Thanks for a query.
If you are suspecting pregnancy, then the best way to confirm would be to get a blood serum beta hCG test done after 10 days of intercourse. If the levels of hCG are more than 1 or raised, then pregnancy is confirmed, else if less than 1, you are not pregnant for sure.
I hope I have addressed your concern.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.