I Had My Last Periods On 24 Th August And

I had my last periods on 24 th august and i had sex on 4th september after that i had a fever and i ate a lot of papaya (ripe) during that..
On 15 september i experienced a brownish flow from vagina.
Today is september 19 there is a white normal dishcharge now
Can i be pregnant?
When i can do a home test?
What should i do now i dont want to have a child.