Hlo i'm 24 year girl. I had sex on 20th feb with protection. I missed my periods after that. I did my first pregnancy test on 11th march it was negative and again I did pregnancy test in april 2 times it was always negative. After that I take regestrone 5 mg 2 times a day for 5 days still don't have my periods today I take last dosage of regestrone 5 mg. When i'm supposed to have my periods. Or it is any chances of pregnancy as the 3 times upt neg.