Are you charting and checking you BBT? Sometimes late O can be caused by stress, but charting and temping should really help show you where you're at.
I took some chinese herbs to help get my AF after coming off BCP, but I wouldn't suggest that to you when TTC because they can cause MC (I'm quitting as soon as AF leaves). There are other herbal teas out there are said to help regulate you, so just do a google search. Just be careful and make sure you look for anything that can cause a MC.