Hello, Thanks for posting your query. Hysterosalpingogram does not delay a natural period. However, the stress associated with the procedure can delay the period. You did not mention when was the follicular study done and if it was followed to detect ovulation. As you are late for your period, I would ask you to go for a home pregnancy test now using a fresh early morning sample of urine. This should be followed by a trans-vaginal sonogram to know the status of the pelvic organs. If negative for pregnancy, you can be prescribed medication to induce a period. Hope you find this information helpful. Take care.