Is it possible for it to just be too early to tell. I’m 5 days past what should have my missed period start and all the pregnancy test are negative. I’m not really stressed but I did have one recent flight that was 7hours long. Could that be really delaying my period? I’m usually one or two days from predicted start date. I also usually get cramping and moody the day before my period and I have none of that. Wondering if my period doesn’t come in the next few days if I need to get a blood test.