I think you’re probably starting labour. By the looks of it, I think that’s your mucus plug. If you say your BH is coming and going I think those are contractions and not BH. Keep timing your contractions. Mine was irregular timing as well for the whole day. But I called up the nurse and she asked me to go hospital. 1hr after I reach my water bag burst and I was 4cm dilated already.
Watch out for more frequent contractions with shorter intervals. Standby waterproof mat or towels in case your water bag burst cause it’s be a gush of water coming out you can’t anticipate or control at all.
Good luck and hope labour will be easy for you!