reikohopes, is ur last AF normal flow? or it's lighter than usual? If it's lighter, it might not be AF, it could be very well be just implantation bleeding.
In fact, carrying heavy things during the 2ww will decrease ur chances as it is straining the womb. and this is especially so for those who have a weak womb. That's why some women experience bleeding during pregnancy and for extreme cases, have to enforced with bed rest...
That's what I understood from my gynae eons ago...