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Your temperature naturally rises in the afternoon and evening, however, a temperature around 99.7-101.0F is considered a fever and could mean you are fighting off a virus that never manifested itself into full-blown symptoms. I think it's a good idea on seeing your Dr if it continues though. Other causes might include thyroid disorders or hormonal disorders...however, with your nasal congestion, it is likely that you are just fighting off an illness that has not fully developed (and may not).
Hope this helps!