Should I be worried?

Carleigh
So my LMP was 31/8/15 meaning I will be 8 weeks tomorrow. I took many tests in the 3 weeks after ovulation and on 5/10/15 (8 days after AF due!) I got my first BFP which was quite faint. The next day I took this FRER and got two equal lines.
I have been feeling anxious as having to wait so long for midwife appt and scan etc so decided to take another test to reassure me. Took this one today (cheap Asda test) and my line looks very faint for 8 weeks? 
What should I do? I have had no bleeding or cramps and still having nasea, fatigue and sore boobs.