So I went off birth control (pills) in October. My period still hasn't gone back to normal since then. How long should it take to regulate itself before I should start making appointments with my Gynecologist? Had a period in October, skipped November, and had one in December. As of right now my period is late by 15 days and I've taken 2 home tests that were negative and urine test and blood test with my regular physician which were also negative. My sister in law said six months.