What are my chances of twins?

G
I got pregnant (4.5 years after our first childn) with first <a href="https://glowing.com/glow-fertility-program">IUI</a> attempt after 50mg of clomid and progesterone suppositories after the <a href="https://glowing.com/glow-fertility-program">IUI</a>. My hcg levels at 5weeks were 4641. I'm already showing a bump at 6 weeks. My first OB scan is tomorrow but I'm soooo curious... Just for fun, what do you'll think? Singleton or twins? Thank you in advance. Will post what the scan shows tomorrow!