I have been having irregular periods. I was to get my periods by the 2nd or 3rd of this month. However I didn't. I had a holiday coming up so I decided to take period postponing pills since they were a nuisance. I started the pills on the other and took them till the 11th. I had sexual intercourse with my husband on the 11th night. We used protection and he ejaculated outside the vagina. I took a
pregnancy test on the 16th and it came out negative. However I have not had my periods even 5 days after. What could be the problem?