negative test, period 4 days late?

Chantelle

hi guys, we are ttc. we baby danced 3 times during my ovulation week. after feeling alot of symptoms, i decided to take a test which came out neg, after that i was 4 days late for my period. AF came on day 5 but it was just a few drops, and the day after that aswell. but now its all cleared up (where AF is usually 5 days and a lot) any advice on what it could be? test on 15 DAO was neg