Please don't repost the same question.
https://www.askmehelpdesk.com/womens...nt-191705.html
Lots of things can cause missed periods... stress, illness, diet, age, etc...
No way at all anyone can positively answer your question. MD's rely on pregnancy tests for a reason. Wish we could tell you a reliable answer, but its impossible.
Time and tests are your course of action.