How long and heavy is implatation bleeding, is this normal??

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BlueP Posts: 238
My sister had her period on the 2nd June and is ttc and since has had bleeding from 21st June to today. He cycle is about 29 days. It started brownish and light now it is very heavy, much heavier than a period and she has some cramps and sore boobs. Is this too heavy to be implantation bleeding? What's your thoughts, am so worried.
lovelycuppatea Posts: 481
Sounds more like a period to be honest. Maybe she's just having a short cycle
Marvin Mole Posts: 1076
I think implantation can vary a lot. I had it on both pregnancies and for me it was very very light and only ever brown in colour. It did last for around a week.