I had sex with my girlfriend last Monday and I used condom
But after 3-4 days of sex she is complaining about a white fluid (mucus type) which is coming continuously from her vagina
We are very worried that this might be the sign of pregnancy
Please guide me

So... you have sex last Monday and you think its possible to find out this soon if she's pregnant? Bwaaaaaaahahahaha.

You both have to wait until she is at least two weeks late for her next period before you can even take the first test. YOU both have to sweat it out until then.

Its way, WAY too soon.