After i eat i have a funny taste in my mouth. tonite i ate fish and every time i burp i can still taste the fish. could i be pregnant?

Only if you had sex: During your fertile time with a fertile man and used inadequate or no protection. It would have nothing to do with the fish and burping (with or without a fishy taste) is not a primary sign of pregnancy. If you've missed a period, have a pregnancy test. Use protection for any sexual activity if you do not want to get pregnant. Best!