Your prayer is invalid and you must repeat it and seek forgiveness from Allah for continuing to act as if you are praying while you have no wudhu.

Today at Fajr i had been asleep and suddenly happend to wake up just after ikamah have been given. so right away from the bed i went to masjid just washing my face thinking I’m having wudu. and after when the imam wents to rukuh i realised i dont have wudu. But I continued the prayer cause it was last rakkah and after the prayer I took wudu and prayed two rakkah sunnah before fajr and asked for forgivness. What am i Supposed to do please help