So i just took some castor oil and..?

anyway i just took some castor oil about half an hour ago. im 39 weeks and my bfs aunt is a nurse and she said itd be ok to take it since im already dilated and effaced...anyway question is im having stomach cramps kinda like i have to have a bm but then idont have to...are those the contractions or the start of them? no judging please just some opinions..the baby is moving fine btw so im sure there is nothing wrong with the baby..