Im breastfeeding my son hes 5 1/2 months and havent had my period yet. i took a pregnancy test it was negative then positive:s?

If having sex, can: Recheck after another week. Home pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a negative result may be due to testing too early.