no2 Could be the red orache as it has pink/red flowers . Also looks to me like fat hen. They are related. There are various types some are more upright than others. Flowers of fat hed sort of grey/green though occasionally come out pink. Relative of spinach. Edible. Passible when very young otherwise a bit soapy for my taste. It will suddenly get taller, fat hen rows up to a metre plus tall can have 1/4 million seeds. Pull it up while you still can. Once they get bigger they are much for difficult to shift. Also known as manure weed. The seeds come out of composting or a cow raring to go, so do not in compost bin once it has set seed. Red orache tends to hug the ground so does not get so tall.
For me red orache is a pain of a weed. Very difficult to pull up because you just break bits off and off it goes again. Trying my best to eradicate it.
No 1 suggest a type of bistort. Though the leaves are a bit too rounded. Should have a pink flower as well. Relative of dock, so suggest you make sure you get the whole root out.
