Trying to conceive

Me n my fiance been ttc for about 3months since my miscarriage back in March but it's hard becuz the way my cycle set up it's coming on 2wice a month... come on @ the end of the month n go off the next following month it happens everytime.. is anyone else experiencing this same problem or know someone Who is like idk What's causing it to happen like that is it healthy yo come on your cycle 2wice a month? Answers please THANKS IN ADVANCE: )