Last day of period?

Light pink or brown spotting at 4 weeks is very common and in most cases is implantation-related rather than a sign of miscarriage. Roughly 20 to 30 percent of pregnancies have some early bleeding, and most continue normally. The colour matters more than the volume: brown suggests older blood, pink suggests fresh but minor, and both are usually reassuring. Heavy red bleeding with strong cramps is the pattern that needs urgent attention, which is not what you are describing.

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Before I answer your question some details are required When was day one of the period last Are you planning a pregnancy

Go for BetaHCG test if you have missed your period date.