I lost my virginity about a year ago had not had sex till a few days ago. Afterwards I noticed a small spot of blood on my under wear is this normal?

Yes This is Normal Usually When Women/Girls have Sexual Intercourse Their Hymen Breaks This Causes It To Bleed, Others may Not Bleed after having Their First Intercourse Because They Might Have had it Break Another Way ( sports, doing a Split w.e ) Or They Aren't Born With A Hymen