Does vaginal douching with hot water and the hand invalidate the fast, as does the retention of semen inside the uterus after intercourse if a woman sleeps and wakes up after Fajr?

The fast is not invalidated by the entry of something into the vagina, nor does the retention of semen inside the uterus affect the validity of the fast. Similarly, its discharge does not necessitate ghusl (ritual bath), but it does invalidate wudu (ablution).