B hcg: 0.1 30 days from last intercourse with girlfriend. can we rule out pregnancy or did we test too soon? do we need to retest?

Tests are accurate: Pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, vaginal spotting, or medications. A urine test gives a reliable result 3 weeks after last sex or 1 week after missing a period. A blood test should be positive by a few days or a week earlier than that, but one need not do blood tests. Urine tests are very accurate and cheap to do.