Worried sick.

We use pull out method all the time, for 4 months now and so far so good. He has came inside me right after my period before my fertile week and nothing, which is good. 
But we simply forgot how far along i was after my peod and he came inside me on my fertile week!! He rapidly told me to try to push out everything and i did. But when i went home and showered i felt as if i still had some inside of me and tried to take it out. 
​How effective is pushing out cum?