My husband and I attempted to conceive for about a week straight before and after my predicted ovulation day. Unfortunately, the time frame I could begin taking HPT was on a educational program to Iceland; he was due to join me 10 days later. The first 4 came back negative. But then my period didn't come. My cycle is long so it wasn't unusual but when it was 3-5 days late, I bought more HPT. The pic below shows day 33, 34, and 35 of my cycle. I'm still not convinced I'm pregnant (could be chemical pregnancy or ectopic?) but we're still in Iceland for another week. I'll keep taking a HPT each day to see if the line continues to darken.