Pregnant? Or need to see a dr?

Caitlin • Im 18SO is 20 😘 engaged Christmas eve 2015 (: chemical in may:( 2015
Im currently 5 dpo started brown spotting, hasnt gotten any heavier, went from brown to a little pink and a little red to brown again, now i feel light headed and gassy(tmi) took a test today, it was negative, should i wait and test? See if the bleeding gets heavier? Could anything else cause it? Not really any cramping either, i usually have horrible cramps, ive felt great! HOT FLASHES ALL DAY!

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