Confused positive

Ok I had a miscarriage in November and I got pregnant recently I am 4 days late so 4 weeks pregnant I would say. My levels as of Tuesday we’re 172... I took this test now but it’s in the middle of the day and I’ve had lots of water. I do kept spotting randomly brown. Not red. So I keep testing because I am cautious.. any thoughts? I see my doctor Tuesday. But I’m very scared that I might be losing again.