Hi welcome to H.C.M.Forum. amenorrhoea with premenstrual symptoms & negative hptests, suggest
pseudo cyasis means false pregnancy
or infection .
some times h.p.test may be wrong in that case lab urine test or blood test
for pregnancy may confirm or exclude the pregnancy. scaning may confirm the position.
besides don't be tense about pregnancy. avoid spices, chillies, junkfoods. eat curd with food. &bland foods to avoid bloating
eat green leafy vegetables , cereals, fruits& juices to build the blood picture.
i advise you to consult a gynaecologist for advise, dont worry everything will be fine.