IUI and Progesterone Suppositories

I am 3 days away from getting my blood work taken for pregnancy. I was experience pretty heavy bleeding and very very mild cramps yesterday. The bleeding stopped halfway through the day. I know both implantation and the suppositories (been on them for 2 weeks, first time seeing spotting) cause “spotting” but it seemed like a lot. It wasn’t my period because i always get excruciating cramps. Any experience with this? Can spotting be on the heavier side and be implantation?