Could this be a sign of twins?

I’m only 11 dpo.. I’m already feeling so sick and tired. Im constipated and find this all so odd. This is baby #4 and I didn’t feel like this until 6 weeks with the others. This line seems dark to me considering my period would be due Tuesday. Thoughts? Is this a sign of twins? They do not run in our family but there is one set.

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