First response test question

Hey everyone,

So the stores by me just recently started selling the first response early response test that are completely flat, alongside the curved tip ones. I know the curved tip ones are notorious for those really faint false positives... how trustworthy are the flat ones? For the last year all I've used is the curved ones so I'm familiar with those false positives, but this time around I bought the flat ones... and I've gotten two very faint second lines today. I'm about 5 weeks post D&C; so I have no idea when I ovulated, my doc just said a period would come in 4-6 weeks after the D&C.; So any thoughts on these tests would be helpful! Thanks!