Help!! I don't what to do

Me and my boyfriend had sex like last week maybe sooner j can't remember, two days ago I took a test and it was neg, all the tests I've taken have been negative, I don't know if I'm taking them too early or what.. And today during school I noticed this wetness and I went to the bathroom and there was like this white discharge and later on I saw a little red  spot of blood... Idk what it is... Help!