if it helps, my boss when she was having hr second bled every month all the way through her pregnancy and it was normal period sized amount.
sometimes you can get a bit if maybe youve over done it a bit, but if your ever concerned just called the community midwives who will advise you,
they normally arent too concerned unless your passing clots or you are having to use a fresh pad every 20 mins, but there is never any harm in asking