So I got af on 8/5 first day was just pink when wiped second say didn't fill one pad in 24 hours third day light pink 4th day spotting since the 11th I feel sick everyday was even sick yesterday and today I'm so tired but surely I can't be pregnant as I'm classing that as my af it was 4 days as normal just lighter im usually heavy day 2/3 and it came around the time it should 2 days early am I over thinking or could there be a chance?