Advice - misscarriage 30 days ago am I pregnant?

Hello all I need some advice - I went to the a n e department on 19th feb with stomach pains ( 6 weeks and 4 days pregnant) my wee samples was showing negative pregnancy test but my bloods showed HCG level as 18, which was to low and they said I would misscarriage on 21st I started bleeding and everything went... I did a pregnancy test on 22nd and it was negative ive had a scan awaiting results ive done a few tests and there faint my cycle is 33 days Few days off my normal period. Am I pregnant? What is going on... Any advice would be greatful . Thank you