Best way to conceive

So we’ve been trying to conceive for about six months now. My periods are finally regular and about 25 days apart since December. Every month has been a let down as my period makes an appearance. We haven’t really used ovulation test so I am really unsure of when I exactly ovulate. But we usually have sex every other day after my cycle ends. I am just confused as to why it hasn’t happened for me yet. We both exercise and we both take vitamins. What are some ways to better our chances? Has anyone ended up pregnant and still have periods? I totally thought we were pregnant this month because I had that feeling bit period showed up today on time. I need answers!!