Okay TTCstill, going by the OPK is the best thing and based on that, you're only 7dpo so don't stress! Relax, take a deep breath and no more POAS until Saturday! I mean it! Now stress is more dangerous to a developing fetus than cigarettes so if it becomes too stressful, it's okay to occasionally have one. This came from a Dr who adviced a woman my husband knows who kept trying to quit when she fell PG just to lose the baby. The last time she continued to smoke (under the Dr's advisement) and carried full term!