When I had worries they checked straightaway and do an internal ultrasound. Just explain you’re really worried and they should try and get you seen!
I wouldn't count on pregnancy tests at this time, I've read they only detect certain levels of HCG, if yours is too high it also won't detect it. Your best bet is to contact your midwife, I hope everything is okay
I would contact you’re midwife and they can get you an early scan fingers crossed everything’s okay