slight pink line on pt ?

Rose
Does a slight pink line always mean pregnancy ? I took a pt this afternoon as I've been spotting a week B4 period due .. anyway it was only a cheep one and I didn't think it would show anything but it did a very very faint line and my partner could see it too .. I took another later and again another line only barely see able compared to the first ... am I pregnant ? or am I getting excited for nothing ! has anyone ever had a slight faint positive and not been pregnant ? I'm not due on until 8th but I have been having my periods a week earlier than normal x