AF Late 18 months TTC

La

AF is 2 days late.

Have been TCC for 18months and booked in for a laparoscopy and dye on 28 Sept so falling pregnant now would be perfect.

Got a BFN this morning and still no AF.

No symptoms of AF, usually have bloating, intense cramps, back ache and moody the day before AF due but just nothing at the moment.

When should I test again?