Thick dark blood?

Cierra
I'm roughly 5 weeks and just had some very thick, dark bleeding when I went to the bathroom. 
I googled it and it said its possibly a blood clot, and that people who smoke are more likely to get blood clots during pregnancy
I'm in the process of quitting, so by the end of the week I will be done. I am cutting down and am now down to about 3 a day. 
Should I be worried?! I have no idea what to do, and I'm worried that it's too early to tell if the baby is still okay. 

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