- Diet and Exercise
- General Health Condition
- Poly-cystic Ovary Syndrome
Everyone has the occasional late period, it can be due to things such as stress or illness, but in your case it is likely purely down to your age - your reproductive cycle is complex so it takes time to work as it should, as you're still developing physically and sexually that can effect your cycles. So even if your periods are normally regular expect them to change occasionally until adulthood.
Tampons are best avoided, there are better options such as menstrual cups. I calculate my ovulate days through this Ovulation Calculator, and I gain instant result
Cups are internal like tampons but far safer and more hygienic so no risk of TSS (you're at far higher risk at your age, thus why it's recommended teens especially should avoid tampon use), vaginal infections, increased cramps or dioxin. This means cups can be worn for 12 hours, with any flow, before your period, overnight, and alternating with pads so cups are more convenient than tampons, plus menstrual cups hold far more flow and have light suction so don't leak like tampons or pads.
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