Hi
Use the oestrogel every day, no breaks. You want a continuous, stable supply of estrogen, fluctuations can cause unpleasant symptoms to return. The progesterone part protects your uterus, the break should trigger a bleed but if you're still having regular periods your body might have it's own idea when to bleed!
I haven't taken sequential hrt myself as I started after menopause (we take continuous progesterone with no break so no bleed on theory) but I think there is usually a longer break than 3 days. Hopefully someone else will be along to advise soon.