question: I am 34 and healthy.  Started to use Nuvaring in December, but with holidays and family stressors, I inadvertently left it in for 6 weeks... I took it out a week ago and inserted a new one yesterday, but have not had my period during my week off.   Home pregnancy tests are negative.  When is the soonest a blood pregnancy test would give me answers.  I'm on topical Retin A and just stopped it.