I gave head to my boyfriend then he came, after 10 mins I gave head again but before he came he?

It's possiable to get pregant anytime a penis is inserted into you, but the timing has to be right, meaning that you are ovalating and the sprem meets the egg. Being that your bf had all ready cum, that do reduces the chance some what. To ease your nerves next time contuine to give him head as well as he give you head also. But have him put on a cover on before. he enter you next time.