Frustrated and trying for a year and a half! Someone give me reassurance!

Jennifer • Married to the love of my life. Trying to make us a baby

I'm 27 and my husband is 25. I've been using glow for the entire time we've been trying. I'm at a healthy weight. (5'4" 125 lbs) I have regular periods that are almost always to the day glow says with a 30 day cycle. I take ovulation tests that turn up positive on the day glow says. We have sex a couple days leading up as well as a couple days after fertile window. I stay laying on my back with a pillow propping my butt up for about 15 minutes after. I am frustrated and I just want to cry!!!!! I just want a baby!!! Please someone tell me there is hope without having to go to a doctor. There has to be women that have tried for as long as I have that have ended up having a baby naturally. I'm just needing reassurance. Please! And tell me what you did differently if anything, I would really appreciate it!