SO CONFUSED!

Me and my husband have been trying to get pregnant since July of 2016 and absolutely NOTHING! I have charted since then as well, and have gotten very familiar with my body and when I ovulate also and I'm just not understanding why nothing is happening! I take prenatal vitamins, eat pretty healthy, no alcohol or smoking, and we don't just have sex during my fertile window, it's usually every day or every other day. I have her of people using some lubricants to try to help with getting pregnant but I also heard lubricant is bad for sperm?? Any suggestions??! I'm desperate!