I'm also having a missing period dilemma Kat, i put mine down to just starting methotrexate, and i read that it can stop or halter the regularity of your cycle. It's so frustrating, and annoying, try not to get worried about it- not best at it i confess, but need to think that our bodies have got so much to be getting on with all the medication we pump into it on a daily basis no wonder some of the regularites struggle. I'm also on a proestrogen pill, which may alter my periods too - don't know if thats the same for you. Just have to keep with it i'm afraid.