Blood while shitting

Im currently 26 weeks pregnant, going 27 weeks. So before my pregnancy I already have constipation . So during pregnancy I can shit once a week or 1 time in 2 weeks. For the past 3 weeks (every week shit once) when I shit, there’s blood. And is look like quite alot of blood at the toilet bowl . Kind of worried . My next consul in 2 weeks time. Any of this happened to any mummy or pregnant lady? *theres no blood or bleed coming from my vagina*