@ncm22 Hi. I have a similar story than yours. I wanted to hit MS hard but have to first start with Tec for some months. Hopefully, I was able to go for Orc one month ago.
I was told to take my last pill of tecfidera the night before the day of my first half infusion of ocrelizumab. The MS specialist told me tecfidera have a very short half-life (actually less than 24 hours since you have to get it twice a day).
To my mind, you should talk with your medical team. I don’t how active is your MS but that’s not great in general to be let without any treatment for 6 weeks.