I don't think EPO can help so much, if you have a long term problem with regularity of your period, then its a hormonal imbalance concern. EPO is very mild, and even if it works it might take longer than one month. The best thing is to consult with a gynae. Make sure you protect yourself, you don't need to ejaculate inside to get pregnant, the man constantly leaks seminal fluid that can also contain sperm. Even washing after sex might not prevent pregnancy. It seems you can kill two birds with one stone by using contraception that will also help to regular your cycle; besides birth control pills there are newer methods such as birth control patch (Evra) or vaginal ring (Nuvaring).