Pregnancy testing

Advise please : a month after sex and negative pregnancy test... is it accurate by now or should I wait ? I last had sex on the 16th of December while I was on the pill but I stopped the pill on the 18th then I got heavy bleeding on the 24-26 and light bleeding a few days after so I had a 6 day period I’m not sure if that was because I stopped the pill since I had already gotten a period December 9-15... I took a blood pregnancy test January 8th and it came back negative but I still don’t feel well so I took a home one and came back negative now ... can I still be pregnant or is it me being paranoid ?