Well my one tip is test twice a day if u can. Most people don't get their lh peak till after lunchtime so if u tested in the morning u might miss it. I tend to test morning, mid afternoon and evening so I don't miss it as I have a short surge. That's the great thing about the cheap Amazon tests it means u can do that. You've fallen preggo before so no doubt u will again so try not to stress.
I am also now taking preconceived tabs and evening primrose oil as well as garlic supplements to help my fertility, and I have hubby on preconceive tabs for men and garlic capsules. Garlic is meant to prevent dna "mutations" within the sperm that can cause miscarriage. Hope all goes well for u! Keep in Touch I'd love to hear how u get on! Xxx