Linea nigra

I have started to get the faint brown line from my naval to pubic bone. ( I got it with my daughter 4 years ago but don't remember much about that pregnancy
Anyway I've been ttc for 5 months, I had a period on 9th July, but I started my next period ( current period) 5th August. It is weird, pink, brown and red spotting. Nothing like my usual period and yesterday I had no bleeding at all. If I was to be pregnant I would be 4 weeks which I don't consider myself to be because of this period but I've got a linea nigra. If I was to be pregnant is it too early to have a linea nigra? And what other causes are there for it? (I've never been on birth control) 

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