So I decided after a lengthy (for me at least) first time ttc that I'd try and narrow things down for myself this time around. My cycles are irregular but with the exception of cycles like my last (65 days!) they roughly run between 30-40 days. I invested in 50 OPKs (cheap ones from amazon) and took one yesterday after they arrived (I thought I may have missed my ovulation but was testing anyway) and it was a definite negative, the line was barely there. Today I took another and it was the same as the test line so a positive, I also have EWCM so definitely think I've read it right but I thought it would be a gradual increase in the darkness of the lines, is this possible to go from almost nothing to a strong positive?