Losing hope

So today I am 12dpo still bfn. Been constipated the last two days, had some cramping in my uterus/groin yesterday and having some mild cramping today too. Super tired, tender breasts, nauseous on and off, a pressure feeling in uterus, veins have become more prominent in breasts, feel like I have to pee all the time, cervix is high and soft, the cramping and constipation is really what’s throwing me off today so im really starting to worry.