Should I drink more castor oil?

I am 40 weeks pregnant, 1cm dilated, 50% effaced. I’ve been having contractions for the last week or so. But still not in labor. I drank 3 oz oz castor oil today 3 hrs apart mixed with orange juice each time. Nothing has happened, my first dose was at 9am. It’s been 9 hours. I’ve only been to the bathroom once and that’s it. No vomiting or anything. Should I try for a 4 dose or just forget it. I’m so miserable and just tired of being pregnant, also ready to meet my baby girls, especially since she’s my 1st and Ive struggled with carrying for years. Help!!