Unprot sex 4 weeks ago, hour later took plan b, period came nxt day for 8 days (heavy) took 4 neg tests 4 wks later but boobs have been sore for awhil?

Pregnancy tests?: Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period.

Agree with Dr. K : If you have any doubt, get a blood test for HCG level.