Hi I am 34 yrs of age and recently was prescribed tablets similar to norethhisterone to delay my period while on holiday. My period was originally due in and around the 25th/26th July but as I only stopped taking the tablets on 28th, my period did not arrive until 1st July. There is now a chance that I could be pregnant and I wanted to know when to expect my next period, will it be 4 weeks from the original date it was due or will my new due date now be around 30th July because I delayed it last time ? Please help