I feel your pain. Ds4 took us 2.5 years and this one was 3.5 years trying, with a loss 7 months in. I hate to falsely get peoples hopes up, but I actually cramped so badly this time that I didn't buy the test I went out to get, then a few days later realised I was late. I hope it happens for you soon. It can be so disheartening month after month.