I had unprotected sex with someone on wednesday and a different guy friday. my throat began hurting pretty badly saturday. could this be an std?

Yes, could be a STI: If you performed oral sex on one of your male partners who had a sexually transmissible infection (STI), your throat symptoms may be due to a STI...but may be due to something else too. A simple clinical evaluation and some bacteriological-viral tests may help answer your question . Get tested and ask a caring Gyn for advice about "safe sex practices" to reduce your risks of pregnancy and of STIs.