I’ve had 3 positive pregnancy tests all within 3/4 weeks.

Tonight my boyfriend woke me up because I guess he saw I was bleeding and he was worried, I went to the bathroom and found this... I told him and he said it’s a miscarriage , possibly from 2nd hand smoke (my dad and mom smoke)

But I was covered in blood, it soaked through my underwear and pants..

Is this a miscarriage or is this just something normal in early pregnancy?

UPDATE:

later in the day I went to use the bathroom and another big blood clump(?) came out.