I'm confused Help please

Kerri

My cycle is normally every 26-30 days. today is day 32 no signs of AF since Monday Iv had slight cramps in my lower tummy. not the AF type,some nausea and lower back pain. I took a HPT yesterday evening and it had a VVVFL Iv took one this morning and it's a BFN. should I phone my doctors? picture is of this morning's test. I'm really confused. I'm gutted. I'm never late for my period either. if I'm not pregnant I'm worried it's something else.