Moving in with someone so quickly is usually not recommended, especially when the relationship is still in its early stages. It's important to take the time to get to know each other better, build trust, and make sure you are compatible in different aspects of your lives before making such a big decision.

Additionally, considering you have only known each other for 3 weeks and have already been intimate, it may be wise to slow things down a bit and focus on building a strong foundation for your relationship first. Rushing into living together may put unnecessary pressure on the relationship and could potentially lead to complications down the road.

I would recommend having an open and honest conversation with your partner about your feelings, expectations, and concerns before making any decisions about moving in together. Take the time to communicate effectively, understand each other's needs and boundaries, and make sure you are both on the same page moving forward.

Overall, it's important to take things slow, prioritize communication and trust, and ensure that you are both ready for such a big step in your relationship.