Diving in to TTC #2

We have been semi-actively trying for almost 2 years and actively trying for about 8 months. Next cycle will be the first time I use opk & bbt as well as start taking prenatals to increase our chances of #2. Our daughter turned 4 in March and we'd like a sibling for between 5-6 years apart. :) anyone else out there ttc #2? Or finally breaking and trying opk, bbt and prenatals?