Advice please?

April
Okay so a few days I took a test and got a very very faint positive. Took again the next day and got a faint positive. But it was more visible. And my period is due tomorrow so my fiancée thought maybe tonight we would get a more clear line. But it's really not helping any. :/ does anyone know when I should test again or if I should just go to the doctor for a blood test? My OBGYN won't do an ultrasound until he thinks I'm 8 weeks.