When to go for a blood test?

Daphne • First time mommy

I had a very very faint line this morning, tested again this evening because I had some spotting and the line is more prominent then this morning.

My cervix got treated with silver nitrate yesterday so I'd guess that's what the bleeding is coming from, i think it's a bit to much and bright for implantation.

Should I get a blood test tomorrow or wait till Monday (AF would arrive Sunday)?