In my second pregnancy I had 3 heavy bleeds. At 7 weeks, 12 weeks (which continues for 4 weeks!!) And again at 19 weeks. My LG is 8 months now ^-^
To begin with scans showed I had a pocket of blood on the outside of the sac. Later in the pregnancy that was reabsorbed and I was diagnosed with 'Cervical Ectropion'. Things like sex, lifting even walking alot could cause a bleed or spotting. It was petrifying! But thankfully everything was fine. Worth researching perhaps xXx