I have the same problem my doctor put me on clomid to regulate my cycle.. it allows you to regulate and still keep trying. This is my second month on clomid and I had an hsg procedure this week.. but no ovulation. Maybe it can still be my month? I am on day 18 keeping my fingers crossed.. :)
My answer prob won't help much, but I know that birth control will regulate but thats not a good idea if you are trying to conceive! So I would call your doc!