Advice immediately please people

Okay so my period came 11 days early this time and was really really painful never had one like this usually 34 days this one was 28 been bleeding a week today and only just stopping just starting to go brown sort of colour when your due to stop bleeding. Does anyone know why this might have happened I started taking seven seas trying for a baby yesterday so only my second tablet today! Do you think periods may be trying to get back to normal as they used to be 28 days I feel like I will never concieve with my periods doing this. Please help x