Two pregnancy tests. One extremely faint positive, took one right after, a clear negative..???

I had sex on Monday and Tuesday last week... We did it briefly without a condom he ejaculated in a condom though. To he on the safe side I took a plan b within the window... I took a test to be sure since it's nearing a week after... Feeling slightly nauseous.. boob slightly sore but nothing serious.. tool a... show more I had sex on Monday and Tuesday last week... We did it briefly without a condom he ejaculated in a condom though. To he on the safe side I took a plan b within the window... I took a test to be sure since it's nearing a week after... Feeling slightly nauseous.. boob slightly sore but nothing serious.. tool a test came out negative with reeeeeally light positive... Took second... Came out clear negative... Should I worry... What should I do? I was going to take another tomorrow morning . And then another this upcoming Sunday since hcg doubles every 2 days... Do u think if I take one tomorrow it's too soon?
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