Random small bruise on belly, is it normal?

Holly • 🌼 mum to Penelope 🧡 baby boy due March 23

So I haven’t been able to see the bottom of my belly for a while now and I just had a bit of an itchy belly below my belly button, so grabbed a mirror to see if I had any stretch marks down there and noticed this random bruise. I know it’s only small but I don’t remember knocking my belly at all so just wanted to know if this is normal or not? Maybe I’m being dramatic but I panic at everything 😂