Since you use protection, (which is AWESOME), you probably are not pregnant. It's true that protection can fail though but usually you know such as condoms breaking (which is very noticeable) or missing your pill, etc. Trackers are great but they really only average numbers and don't test hormones. So, they can be off if you have an odd cycle. Things that make us late are stress, changes in routine, illness, weight gain or loss, hormones or a slow thyroid. Likely you are just late. Let us know!