36+2 weeks..baby has not dropped

Blossom

Had a growth scan yesterday..doctor said baby head is in 95 percentile and baby has not dropped yet. As baby head is big, and if I don't get labor soon, I may have to go for c-section. Is it okay if baby has not dropped after 36weeks, how many days/weeks after baby drops, you will go to labor? This is my first pregnancy and I don't have any signs of labour