plan b misuse?? it is okay to not completely use a pill

so i took a plan b (Levonorgestrel) less than 6 hours after i had sex because after my partner came in a condom; he took it off and we did it without a condom. i don’t have birth control and i’m concerned that i might’ve not used all of the pill?? because it was my first time using a plan b and i wasn’t expecting it to dissolve so quickly so i panicked and fetched water into my mouth underneath the faucet and water came out of my mouth and i’m worried that some of the dissolved pill didn’t go into my system and down the drain instead. is it okay to not use all of the plan b?