I had sex on the 22nd of January, I took contraceptives on the 23rd of January, I had my period on the 25th of January, and had sex on the last day of my period 29th January, I also took contraceptive on the 30th of January. On the 5th and 6th of February I had bleeding I used pad for 2days, Now my period is suppose to come on the 18th of February up till now no period I'm 3days late . What could be wrong please help me?