I had all pregnancy symptoms for two weeks, but didn't want to take a test till I missed my period. Two nights ago my period started first light, now its heavy and clotty. Does that mean that I wasn't pregnant to begin with?

If you get your period you are probably not pregnant.  However, some women do bleed while they are pregnant--it isn't an actual period but it can look like it is.  I would still take a pregnancy test, if I were you to be more sure.  Over the counter tests are inexpensive and if you use them right tend to be fairly accurate.