help me

erin

had sex using withdraw method thursday september 7. had spotting with clots the 18-20. i took a plan b immediately after. took pregnancy test this sunday and it was negative. 2 hours later it turned positive but the test said to ignore changes after 10 min of results. what do you think? period is due in 5 days, i've had tender nipples all tnus last week. do you think it's the plan b giving me symptoms