Spotting at 4 or 5 weeks

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I am about 4 or 5 weeks pregnant, just found out last week and have been experiencing brown spotting off and on. Only when I wipe after using the restroom. This is my first pregnancy and I am really worried. My HPT with week predictor said 1-2 last week and this morning said 2-3 so that's a good sign, but I'm so worried about this spotting. Any advice?