Hello, and I hope I can help you today. Tri-Sprintec is a birth control pill that has a triphasic regimen; which means that each color pill in the package has a slightly different dose of hormones. Occasionally, women who take triphasic pills may have some spotting in the first few days after each pill strength changes over the course of the month. This may cause some slight bleeding or spotting when were not supposed to have your period. Whenever you had vaginal bleeding, regardless of the cause, usually there is some cramping that accompanies it. Furthermore, it is not unusual to have irregular bleeding or spotting in the first 3 months of pill use. Both Sprintec and Tri-Sprintec are considered low-dose birth control pills, however there are many brands on the market that have a lower dose of estrogen than the pill you are currently taking. so you may have less irregular bleeding and spotting on a different kind of monophasic (same dose all month) birth control pill. Regarding pregnancy, the chance of your conceiving while taking birth control pills and using a condom is basically nonexistent. So I believe the symptoms you were experiencing are side effects due to the new birth control pill. If you re desire is for lighter, regular periods, a different brand of monophasic pill may work better for you with fewer side effects. I hope I was able to adequately answer questions today, and that my advice was helpful. Best wishes, Dr. Brown