The chances of pregnancy are less but nor impossible.These can be the early symptoms of pregnancy but you can
confirm your status of pregnancy be having a urine for pregnancy test after 1 week of your missed periods date
or a serum HCG test from a lab.I it comes out negative then pls consult a gynecologist and discuss the
possibilities of delayed periods with her.It usually occurs due to stress,anxiety,hormonal imbalance, eating
disorder, increased smoking, alcohol or caffeine use,PCOS,fibroid,polyps and endometriosis. Hope it helps.
Take care and regards.