Entocort usually causes heavy menstruation. I once went to the ER and was very dizzy and sufferied from low blood pressure. When they knew I had my period and I was bleeding a lot, they suspected I had a homerrhage. They ordered an INR test and it came out negative. Since then, I learnt that it was Entocort playing around. Some other times it messes up my menstruation and I either get it more than a week in advance or it is delayed.
Good luck