Quick answer
Can I pray before ghusl after my period ends?
No. Once the signs of purity appear, you must perform ghusl al-ḥayḍ before praying. Until ghusl is completed you remain in major ritual impurity, so ṣalāh is not valid — even though the bleeding has stopped.
No. After ḥayḍ ends and a sign of purity appears, you are still in a state of major ritual impurity (ḥadath akbar) until you perform ghusl. Prayer is not valid in this state, so you must complete ghusl al-ḥayḍ before praying. This is the agreement of the four Sunni madhhabs.
The bleeding stopping is not, by itself, what permits prayer — it is the ghusl that lifts the impurity. ʿĀʾishah (raḍiyallāhu ʿanhā) reported the Prophet ﷺ instructing a menstruating woman: 'when its time has passed, wash the blood from yourself and pray.' (Sahih al-Bukhari) — the washing precedes the prayer.
Because of this, timing matters. If purity returns shortly before fajr or maghrib, perform ghusl promptly so you do not miss the prayer. In the Shafiʿi and Hanbali schools, if purity returns with enough time before maghrib expires to perform ghusl and pray, both ẓuhr-period prayers (ʿaṣr, and likewise ʿishāʾ with maghrib) can become due.
Wuḍū alone is not sufficient after ḥayḍ — only a full ghusl lifts the major impurity. Noor tells you the moment worship resumes once you log the signs of purity, so you know exactly when ghusl and the next prayer are due.
This summary draws on the established positions of the four Sunni madhhabs. For your specific situation, consult a qualified scholar.
Go deeper
Ghusl after menstruation: step-by-step