Missed period on tri-sprintec

Hi,
Welcome to ehealthforum.
While you are on birth control pills, usually your ovulation (egg release from ovaries) is suppressed. Sometimes however ovulation can occur if you have missed taking pills on scheduled time. In that case there is chance that you could have got pregnant. Look out for symptoms suggestive of early pregnancy that includes: fatigue, nausea, back pain, abdomen cramps, increased hunger, sleep and frequency of urination, mood changes, headaches, breast soreness, nipple sensitivity.
If you have any of these or if you do suspect being pregnant, then go ahead with an examination done by your gynecologist along with a blood beta HCG level test done to confirm/rule out pregnancy. Another option is to wait and see if your periods start within next 1 week (as they could be delayed due to stress too), and if they do not start within this time, then go ahead with your visit to gynecologist.
Take care.