Ground ivy isn’t actually a type of ivy: it’s related to the dead nettles. Dead nettles aren’t nettles, either.
Be that as it may, ground ivy is still worth looking out for. It’s inconspicuous because it clings to the ground. The flowers might, at first glance, be mistaken for violets, which tend to flower at a similar time of year. They are described as having a strong smell of blackcurrant or of tom-cats(!). I’ve never bent down far enough to test whether that’s true.