Twitches?

So this is my 3rd baby. I’m 4 weeks 5 days pregnant. I don’t get my first appointment until June 6th. I noticed in my last pregnancy that I could not keep my B12 levels high at all and I dealt with some terrible side effects. Now that I’m pregnant again I started B12 right away so I’m on 2,500mcg plus the additional amount in my prenatal and that being 2.8mcg. So I’m not worried about my levels being low especially because it doesn’t feel like it. I will ask for blood work at my appointment but that’s a ways off. Anyways I notice my legs twitching quite a bit especially when I relax or try to go to sleep. Anyone else have or had this? What was it?