Possibly pregnant or not

Had sex on dec. 20th, think i ovulated on the 25, but chart says 28th, been sick, took test on 11th of jan.. date of period pose to been starting, and it was a very faint faint line
had sex on the 12th, and period came on 13th, but still feeling sick.... and had a discharge on the 16th.... could i still be pregnant????

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