I've got three, and yes this is the mating season. They snort and puff away for hours. So expect little hoglets soon. Here's some advice from a website.
If you’re lucky enough to have a nursing hedgehog in the garden, be sure to give her plenty of space. Disturbance can cause a mother to abandon her hoglets in the early days so be extra careful in the garden in case there’s any hidden hedgehog families. After mating, a female hedgehog will be pregnant for around four weeks, before giving birth to between four and seven hoglets.
Enjoy.