I was on the pill for around 10 years the first time and a couple of years the second time. I had 28 day cycles before and after the 10 year usage. The second time round I also had fairly regular cycles (within a couple of dys of 28 days).

For sure use charting. It's very helpful for pinpointing when you are fertile and in my case I suspected I was pregnant earlier than a HPT could work due to two and three day temp dips in successful cycles. It was great cos I knew I could test early and most likely I'd get a positive.

Be careful about using Vitex as has been suggested. I was on it to help with mood swings and I had two early miscarriages whilst on it. I went off it and the next pregnancy was successful. There's heaps of annecdotal evidence on the net that it causes early m/c. Just use a search engine with Vitex and miscarriage and you'll see what I mean. A few days after I'd stop taking it I would miscarry. You can't continue to take it whilst pregnant so it's a catch 22.