Im 4 and a half weeks pregnant, found out a week ago with a very faint line, since then I have been trsting every ither day (as you do) the line is getting darker and darker. Only yesturday went to a and e, possible blood clot they gave me blood thiner not too sure what it was called tested again this morning line still here but slightly fainter than yesterdays test. Is this a sign it might effect my pregnancy? Or is it just the blood thinner decreasing my Hcg levels detectable ?