Hi I m 25yrs. Old. I have irregular periods On december i have started taken a slimming coffee also on January ihave started exercising and lose bout 6-7kgfast . Last month my expected period should have started on jan.17,2017but didn t came instead i had brown discharge for two days on the 18th or 19th of January but most of the time i have brown discharge before having or my period is near. But on the 21nd of January i had unprotected sex using the pull out method. On December 2016 i had my period around dec.9-13 from what i remembered. On jan.22 i have taken a antihistamine tab called virlix for 3 day since i had rashes and can t control the itch after 2 days i went to our local dermatologist to have my skin checked then i have very dry skin and gave me antihistamine tabs loratadine have to drink it for 2 times a day for 4 days. I m wondering if the antihistamine has anything to do with my clycle. I have been experiencing cramps on my left ovary mostly and having sharp stinging pain it also happened on my right side from feb1-4 2017 also with lower back pains. I also have tired joints and tender breast on the third day of my cramps but no darkening or nipples and it just slightly hurts the cramps gets more painful everyday. I m wondering if this is a sign of implantation or just PMS don t have any weird food cravings just sweets like chocolate and salty chips the usual when my period is near. Hope to have a fast response.Thanks. Hi ma am