HCG levels need advice

Kim • Happy fur baby mom
Had mc on Feb 19th, it was a blighted ovum, bled for 1 wk then stopped for a week then for 3 more days, but my hcg level is still at 300 as of last Monday go for another test next Monday but my question is why is it taking so long for the hcg to disappear is this normal? I see many women on here who've had mc around same time getting bfps now....I'm happy for them but I'm just saying why the hell is mine taking forever to go down my biological clock is ticking away fast over here. Anyone else have experience with this?