I got preganant on the pill orthotrycyclin. I got pregant again on the pill with orthoevra. I got pregant again on the pill with nordete 28. I got preganat again when I was on the depo provera shot, and I got preganant again on loestrin. Yes I have 5 kids all birth control babies. Birth control did not work for me and we later found out that I have an extra set of hormones. Now i have my tubes tied cut and burned. I had early symptoms with my pregnanicies so I would say yeah it is possible that you could be pregnant or you could have a uti. I would go see your doctor...
If the pill is used incorrectly the chance of getting pregnant is increased significantly (above the regular 5% failure rate of the pill). Anytime you have unprotected sex and either dont use birth control, or fail to use it correctly you run the risk of pregnancy. The only thing you can do is wait until a "normal" period is due (approximately 2 weeks after ovulation or 2 weeks after you think you were at risk for getting pregnant) and then take a test. Some tests are very sensitive and can detect pregnancy before you period is actually due (1st response is one example) - you may be able to test now w/ first morning urine.
The symptoms are discuss are typical of pregnancy BUT most people dont experience these until after they have missed their period. Is it possible you have a UTI?