Sex feels like work :(

Me and my hubby have been trying to conceive but no luck yet. I took a pregnancy test today and it came out negative. I keep trying and trying but after today I think I'm going to stop and take some time to myself. Relaxing with a beer in my hand. Is it wrong of me to call it quits for now. I'm very impatient when it comes to waiting. I know I should learn to be more patient because things like this take time. Sex now a days seem more like work than actual pleasure. I want to have another baby but I don't want sex to feel like work. Am I wrong for Calling it quits? Plz no rude comments.