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The symptoms (frequent urination, irritation, increased tiredness, increased appetite, dizziness, nausea, missed period, shorter and lighter/abnormal period) that you describe could be suggestive of possibility of pregnancy. Hormonal changes during pregnancy and after intercourse can make vagina more susceptible to infection. If infection is detected, get started on appropriate treatment at the earliest. Get your partner also treated simultaneously to prevent re-infection. Take adequate rest. Drink plenty of water. Maintain healthy diet. If pregnancy is suspected, go ahead with visiting your gynecologist/obstetrician for examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
Take care.