I have missed my period I am almost 3 weeks late. At the moment I am on day 48 of my cycle. (when my last two cycles have been 30 days) I have done 3 home pregnancy tests and they all have come up negative. I havent been pregnant before so dont know what to expect even if I was. The last time I went for a blood test at the beginning of the year it stated that i had a high prolactin level... I'm curious, could this affect a pregnancy test result? Could it come up negative even if I was pregnant? Also how long should I leave it to see my doctor?