Super Early

So we found out we are expecting super early! Based off my period I would be 9 weeks but I'm actually only four! That means I passed a home pregnancy test and like 2 1/2 weeks! Is that normal?? We are super excited 💙 This is a zoomed out picture but the black circle is the sac and the white dot is my little 🤰🏼💕 Twins run in the family and my HCG levels are above the 2,000's! Anybody have experience with twins?? It's too early to see two yet but we are thinking it's a possibility??