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Advice please

I only get super faint positives in the afternoon around 4-6 no other time of day. If I use FMU it's always negative. But when I come home from work and test I get super faint lines. Anyone else experienced this? Am I at a higher risk for miscarriage.

The only odd thing about it I had what I thought was my period March 7. So with that my last period was Feb 4 and Id be closer to 7 weeks. So I don't understand why it's so faint.