It’s lovely that you are so interested in the hedgehogs. That being so, you might be interested in a book about them: Hedgehogs by Pat Morris. There have been several versions, so try to make sure you get a recent version.
Meanwhile you might like to check out the information at https://www.hedgehogstreet.org/about-hedgehogs/hoglets/
But briefly, hogs have large ranges – the males can travel up to 2 miles per night. The females ranges tend to be smaller, and they could decide to give birth anywhere suitable within their range. Litter sizes can be approx. 4 – 7, but there is quite a high mortality rate so that 2 or 3 successfully weaned is more likely. If there are both males and females around mating can take place so, hoglets can arrive from early in the Spring and there are often some around into the autumn and winter.
Good luck. I hope you manage to spot some hoglets where you are – they are good fun to watch!