If your on birth control and you have symptoms of pregnancy, can you be pregnant?

Usually not: Birth control pills are quite reliable. However there is a chance of pregnancy if you miss or are late taking your pill. If you are concerned take a pregnancy test to check. And if you don't have a period at the end of a pill pack when you usually do check a pregnancy test.

Possibly: Altho bcp's are highly effective, they are not 100% effective: according to planned parenthood site, "fewer than 1 out of 100 women will get pregnant each year if they always take the pill each day as directed. About 9 out of 100 women will get pregnant each year if they don’t always take the pill each day as directed." do home pregnancy test, or see doc for blood pregnancy test & evaluation.

Do a quick HPT: Home pregnancy tests are easy to do, fast, and highly accurate. So, u can get this answer in just a few minutes. Every normal menstruating female experiences some symptoms/changes of her cycles during the reproductive years, so it is hard to tell from what you experience; even being on the pill you can still get pregnant--chance is low. If you have additional concern, consult doc. Good luck.