Pregnant or is something wrong

I had unprotected sex on the 12 and 13th of May as I was excepting to see my period on the 19th.I took postinor 2 on the 12th.. I didn't see my period until the 24th but it was a lil slimy . I used 2 pads on the 24th and the next day ,just 1. The 3rd day my period was so light that the pad wasn't even filled up. On sunday not even a drop(my period usually last 4-5days) this morning just a drop of blood and bad cramps.I have taken 2 home preg test (22th n 24th) which caame out negative and I am drinking weight loss tea. I want to know if am preg or if something is wrong with