Yes, that’s possible!
There’s no issue with using the trackle sensor along with a menstrual disc (e.g., femdisc).
Since the femdisc sits directly at the cervix and can even be worn during intercourse, it’s unlikely to come into contact with the trackle sensor, which sits lower in the vagina.
Is there anything I should be aware of?
If any issues arise, they are more likely to affect the menstrual disc, for example:
Fit and stability: The disc might not stay in place as securely.
Leaking: In rare cases, the femdisc might not form a perfect seal
If you're unsure, try out the combination to see if it feels comfortable and works well for you. With the code "trackle", you get 10% off in the Femdisc shop!