hey my periods have always been fairly long cycles (between38-41 days) but the last few months they have got shorter and shorter with my last one being 28days, however the average cycle length is now 31 days. i had a tiny bit of blood 2 days ago put a tampon in thinking my period had started as it felt like it had but wen i went to change it there was nothing on it at all and havent had anything since im now on day 35 of my cycle had a neg preg test result so just wondering wat the blood was and if i should worry.