I had sex with my fiance on the 11th of

Patient: I had sex with my fiance on the 11th of april and saw my period on d 16th and he travelled out of the country. I was expecting my period on the 16th of may and till now 30th I have not seen it.I was worried and did a urine pregnacy stripe test and it was negative and am worried about the delay in my period. could I be pregnant even after seeing my period last month?

Doctor: