I have because I have periods that are not regular all the time.
The period after I lost my virginity took 42 days to get there. I was a WRECK! I was 16, and in High School and scared to death. For some reason (I don't even remember because it was so long ago) I didn't take a pregnancy test. I was so scared, and My Man was kind of like, "Oh, it'll be OK." He was an adult, a little concerned, but I wanted to get my education and didn't want to be pregnant. We were using birth control. But, I was late and scared. I remember getting my period in the bathroom of the store I worked in at the mall. I was NEVER so happy to see blood on my panties!
I called him from the store phone and told him "in code." He told me later he was really worried, but didn't panic so I wouldn't. I got a diaphragm the next week, then a few months later went on the Pill.
I've had a few since we've been married. A few ended up with babies! But, we wanted babies, so it wasn't a big deal. Well, the babies were a big deal, but I wasn't scared like I was when I was a teenage and had a few scares.
I took a number of pregnancy tests since I started peri-menopause. My periods are weird, and some are late, and this month I got my period only about 2 and a half weeks after the last one. All the tests are negative, thank heavens. So I never know when I'm going to get one. I was never really regular, but it's still scary when you go weeks and weeks without one.