Soooooo🤔🤔

So I decided to just go on ahead and take the NIPT test with my doctors but quick Question?? I knoe this may sound like super stupid and silly but do our blood 🩸just generally generate on its own like how does our body make more of it I’m super curious y because I’m always getting poked and prodded and blood drawn from me that I feel like I have nun left to give Lml now I knoe I said it’s silly but it’s how I feel I feel super drained after blood is drawn from me is this how anyone else feels