Itching during your period is usually from moisture, sweat and friction with pads, or from a yeast infection that period blood can make more likely. A vaginal wash like Triben V is meant for a confirmed infection, and using it without knowing the exact cause can sometimes irritate things further or mask what's actually going on.
Next Steps
Change your pad every 3 to 4 hours, wear loose cotton underwear, and rinse with plain water rather than scented washes until you know the cause.
Health Tips
If the itching continues past your period, or you notice unusual discharge, odour or soreness, please see a gynaecologist so the right treatment can be confirmed.