4 days late bfn

I have regular cycles of 26 days. I am currently on day 30. I have had only bfn with FRER.

I have been prescribed a medication for a medical condition that effects my prolactin levels and can therefore cause breast pain, breast enlargement and lack of a period (in 10-15% of women). However, I did not have any of these symptoms the first two months on this medication.

Current symptoms are feeling very wet (normally dry before period), extremely tired, intermittent dizziness, nipple pain, increased hunger, nausea and vomiting (which the medication I’m taking is supposed to prevent), I’m 4 days late and I am really hoping for a bfp!

Any chance this is just taking longer to show up on the tests?