I have unprotected sex and then took plan b on June 19th then on July 1st I got my period that lasted 6 days but had to take plan b again on July 11th then on July 17th I was bleeding for 3 days and then it stopped. My breasts are a little sore and feel swollen/full is that a side affect of plan b? That's the only sign that I have. Could I be pregnant?