Can I be pregnant? Test negative, period late but got it.

Patient: Hello,I had an intercourse on 15th April, unprotected but my partner ejaculated outside. My period was supposed to come on 19th but it got late three days and came today on 22nd April. As today it was also 7 days after the intercourse I did pregnancy test and it was negative. I am wondering can I still be pregnant?

Symptoms: No symptoms