Late and a negative

I’m on cycle day 34 with no period. I usually start on cycle day 29. The latest I’ve ever started in the last 6 months has been cycle day 31. I’ve done 2 pregnancy tests and they’re both negative. I think it’s important to note I’ve had a lot of stress the last week. But that’s getting better. What does this mean? 😩 we’ve been ttc for a year this month and I’m trying not to get discouraged but it’s hard.