Should i be worried if a sudden tiny drop of blood appeared on my 26th week of pregnancy? Just today

You should get it checked out. I had very minor spotting at 32 weeks and admitted myself into hospital to find out that I was having contractions that I couldn’t feel. In the end was diagnosed with threatened preterm labour. Gynae gave me a jab to stop the contractions and luckily it worked and baby stayed in there till full term.