There are several options:
1) Most birth control pill packs have a toll free number you can call if you have any questions. Tri- Sprintec should also.
2) If they do not have a number you could call Planned Parenthood if you are in the United States. Their toll free number is 1-800-230-PLAN.
3) The general concensus says to stop taking the pill, throw away the remainder of the pack, use an alternate form of birth control, and wait until you have your period. Then start on the new pack.
Also, you may want to rethink whether the birth control pill is the best choice for you since you are having trouble taking it properly. It is very important that you take the pills in order, especially Tri Sprintec, because the active pills have different dosages.