Are you getting a regular AF Smash? If you are getting AF, it may be all right just to try naturally for a while. If your cycle is any longer than 40 days, I would probably seek a second opinion because that would make timing BD very difficult.
If you want to try some more natural remedies to regulate AF, I'm pretty sure the health food store sell a supplement that can help with that. I would also start a BBT chart on fertilityfriend.com so that you can start recognising the different phases of your cycle.
AFM: I have 2 more shifts at work and tomorrow is my last day. Yeeeaaaaahhhh!!!! So tired every day. I need to start stock piling some energy before labour.