Advice please

Hi, me and my partner have been ttc for 3/4 months after having the implant out I started using opks this month and I got positives around the 5th/6th and we bd more or less every day I was due af last Wednesday the 19th and didn’t come on so am 4 days late now but up till yesterday still getting negative tests and no sign of af I have a bit of pink discharge on Sunday the 16th now nothing since what is going on I normally have soar bb’s leading up to af and bad cramps and spots I have had none of these except a bit of a dull ache on my right side and lower back and a little shooting pain down below I’m in limbo surely it would be showing on a pregnancy test by now ? Any advice would be appreciated thank you in advance