pregnant? please help

So my period is 10 days late and 2 days ago I was having a lot of discharge that looked a lot like a yeast infection but now there's no discharge. I took a pregnancy test 2 days ago as well and it said not pregnant and i haven't had the symptoms but my period still hasn't come. But when I had sex with my boyfriend, I bled a little then there as more bleeding but then it stopped for the rest of the day. I really don't want a baby; I don't know what's going on with my body.