So I bought done of the new FRER tests and I understand that they have a wider absorbant tip l and a slightly curved handle, however when I used the test (and I followed these instructions very carefully. However I noticed a bubble forming underneath the test window. The test was bfn and in all honesty I tested really early, but I'm concerned about other tests having a problem with this bubble. Anyone el see have a problem with the quality of the test? Are they still just as sensitive?