Possible second ectopic

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I only have one tube left due to previous ectopic last February. I also had a miscarriage at 10 weeks in November. I’ve had previous chemical pregnancies so I know what the bleeding should be like. I found out I was pregnant again one week ago but from the very start I had brown discharge with blood it’s exactly like the discharge I had from previous ectopic. However with previous ectopic my pregnancy test were getting darker, this time the test got lighter but then stayed the same lightness haven’t increased or decreased, anyone had this before? I’m certain it’s another ectopic in my only tube left but do pregnancy test get lighter and then stay light with ectopic I thought it should have gone negative by now.