Toddler nursing all night

I am almost 10 weeks pregnant with my second and suddenly my 20 month old is constantly wanting to nurse at night. We have stretches here and there where she won't nurse but she's more and more consistently trying to latch all night long. She refuses bottles and weaning isn't an option currently due to how strong willed she is when it comes to wanting to nurse (she will cry and scream relentlessly). I love nursing, but is the uptick in frequency because of pregnancy and her wanting more closeness?