Hi Tasha - congratulations again on your pregnancy.
The feeling like AF is coming is confusing - I clearly remember feeling this way with DS1, lots of little niggles and cramping. Afterwards I reasoned that things need to "grow" in that region from day 1 ... so it makes sense there's some mild sensations. As for no implantation bleed. It doesn't always happen. For me it did with DS1, nothing with DS2 and I thought I had the start of AF with DS3 (but the start of that pregnancy was a whole different kettle of fish compared to my first two). Also, I didn't get sore boobs at all with any of my pregnancies - no idea why.
We TTC for over 12 months to get DS3, so to some (minor) extent I can relate to what you're feeling - especially as DS3's pregnancy was touch-and-go in the first 7-8 weeks. I hung out for every BT (two a week) and scan during that time.
Good luck with your BTs and I truly wish you a happy and healthy nine-odd months.
xx

ETA: Out of interest, are you still doing acupuncture/chinese herbs? My acupuncturist helped "anchor" DS3's pregnancy ... at least I firmly believe she did.