I'm currently 6/7dpo , I've been having prominent cramping and back ache all of today! Enough to make me want a hot water bottle! AF isn't due till the 7th of July, I've just had a shower and noticed that the bumps on nipple (Montgomery tubercles I think) are different to what they normally are , they're bigger and more Noticeable! And my actual nipple is incredibly sore to touch? Is this normal? A sign of implantation? Please help a girl out!