I also have regular periods and I was put on bc for 6 months and then taken off to see if we would get pregnant. We didn't and now we found out that it's my husbands semen!
Last year my obgyn put me on b/c for 2 months thinking that it might restart my process and help fertility. It didn't do anything for me.
PS. I do have very regular periods.
I started bc pill on cd 3 and will continue for 21 days. It's basically a fresh start so that once i begin injectables the follicles will all be same size (so my dr told me).
I would definatly check into seeing if there could be something wrong with your husbands Semen.....that could be it. I don't think getting On and off BC pills help if you're periods are already regular. I think that's only if you aren't regular that it helps to regulate your cycles thus making it easier to catch O.