... and continued having unprotected till Friday and Tuesday morning my periods started and only lasted till Wednesday. Could I be pregnant?
Yes, you could be pregnant. The Manufacturer of Plan B state on their website that you are not covered for any episodes of sex that happen once you have taken the drug.
As it was, you were only around 75% covered for the sex you had on the Sunday, because of how late you left it to take the Drug.
As we are now outside the 5 days timescale during which you could use other emergency contraception, it's just going to be a case of waiting to see if you miss your next period, & doing a pregnancy test if you do.
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