There are chances of pregnancy if you are not on any birth control method. This bleeding second time could possibly be implantation bleeding if you are pregnant. Are you also having any other symptoms suggestive of pregnancy like nausea, vomiting, increased urinary frequency and sore breasts? Pregnancy, endometriosis, infections of the reproductive tract, hormonal changes all can cause irregular cycles. If you suspect that you are pregnant consulting a healthcare professional will be helpful. Take up pregnancy test. Do keep me posted.
Best luck and regards!
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