Need Advice. 30 weeks tomorrow.

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So for the last three weeks I have woken up and peed, and when I wipe there is a bit of blood. This has happened once a week not everyday for the past 3 weeks. I have told my doctor but he did not seem concerned. Well today I woke up and same. I turn 30 weeks

tomorrow and I have a prenatal appointment and I will bring it up to my doctor again. Have any of you ladies experience this?