You can become prego any time HOWEVER it is highly unlikely your most fertile time is around the time when you ovulate which is approximately 14 days BEFORE your period...you are probably fine...lots of woman purposefully baby dance around ovulation to conceive yet aren't able to...
it is possible to get pregnant at any time even if you are having a period.if you dont want to become pregnant i suggest you use contraception . you could become pregnant before your partner ejaculates, your partners penis leeks sperm before ejaculation.