Spotting 31 weeks

My toddler has just woken up at 4:30am 😣 and I popped to the toilet for a wee. When I wiped there was a small amount of pink staining/spotting.

Do I need to call my midwife? Yesterday my vulva felt very swollen and puffy so not sure if it’s linked?

I’m 31 weeks exactly and this is baby number 2