welcome to HCM.
You are carrying 10 wks of pregnancy
and now presents with lower abdominal pain
on left side and got spotting 3 days ago.
It may be due to implantational or early abortion
bleeding. It may precipitate further to a misscarriage. So better to avoid love making or sexual intercourse in this time.
Mild abdominal pain and LBP is usual in pregnancy.So don't worry. Take healthy diet,avoid stress
and sleep well.
Consult to your doctor if still bleeding persists.
All the best.