Can douching with lemon make ur period go up?

No. There is no scientific evidence to think that that would do anything. Lemon juice may be very irritating to the vagina as well. I would not do this.
No. Douching doesn't start your period. But it can irritate the vagina or cervix and cause bleeding. It also increases the chance for a vaginal bacterial infection, which is why we don't recommend douching. The vagina is self cleaning generally.