Ejaculated in tissue and threw it in toilet,after that i still had some semen on hand and pressed toilet flush .can someone get pregnant short after?

PG not in"hand(le)": Sperm on the toilet handle or hand do not survive unless a warm moist vaginal/vulvar environment is present for them to "swim to Nirvana" for pregnancy(PG) to occur.

Probably not, but...: Considering the high fastidious requirements for sperm survival, your described scenario should pose an almost zero odd to conceive. Nonetheless, always do HPT in 7-10 days after missing expected period and repeat it in another 7-10 days if the first HPT is (-) and still in doubt.