How long to get pregnant?!

How long did it take everyone to get pregnant? I've been trying for 5 months, this being my 5th cycle. I'm currently 8DPO and had 1 BFN so far. 
I'm in my early 20's and my cycles are 35/36 days and I'm getting my positive opk on the 22nd of my cycle. 
Any tips to improve fertility?