The first time I went on the pill I had svere morning sickness, made my body think it was pg, apparantley my mum was the same.
go see your gp or local sexual health clinic, they should be able to give you a few packets to try out for a month or two to find the one thats right for you.
everyone is different and there are so many different types of pills available these days, hope you can sort it out!
xxx