Does sound like your plug but those can 'fall out' any number of weeks before labour starts ... It sounds like you are lumbering up nicely for the event though obviously still very early so if the BH get really frequent and uncomfortable definitely head for the hospital for a check up sooner rather than later
I think it's just normal pregnancy pains Hun. I'm 30+4 with baby no.5 and been experiencing the same, very strong Braxtons all week that have taken my breath away at times. If u start experiencing strong period type pains quite regularly then do call Maternity Triage Hun.
OP, I had similar at 29 weeks and went into preterm labour shortly afterwards (previously a problem-free pregnancy). This is not to say that it'll be the case for you, but the period-type pains + discharge would worry me. I'm glad you saw a midwife today, but please do call maternity triage and tell them what you told us.