Plan b... Super late bfn still

Ok, so I took plan b at time of ovlulation then vomited it up around an hour later thanks to GERD, and this is over a month ago now...

I missed my AF & I'm now 24 days late, on day 52 of my cycle.

Still testing bfn and no AF symptoms at all (I always have certain symptoms ). No spotting or anything. No cramps. No 💩 issues.

I've since been nauseous throughout the day, which is not the norm for me.

Is it possible that I am pregnant but not testing positive?

I'm going to try and get a blood test done next week.