Bots that Crawl the Web and make Accounts and Fake Purchases at your Shopify Store

Hi, I'm new to eCommerce and B2C in general. The moment we have put our new Shopify store online, we received registrations from fake accounts. At the moment we get 2-3 per day. We have not done any SEO so far or anything. The store is not even completed yet. Is this normal? Do I need to be worried about this? We have activated the captcha but still.