Hi! Congrats on your new bunny!
I suggest bringing your bunny to the vet one day (even if it's just to trim it's claws) and to ask your vet to check it out for you, 'cause it's really hard to see the difference if you're not used to it.
When I got my bunny, the people at the shelter told me that it was definitely a male and, from what I had heard of different ways to distinguish a male from a female, it made sense. But a year later, at our first vet visit
, I learned that Thumper was a female..