Not sure if pregnant or am i getting my period

hi
really love some honest advise. me and my hubby decided last month wud try for a baby. we been together 5 and a half yrs and never tried before although we dont use any protection.
my periods were all over the place till i lost 4 stone now they are regular. well 2 weeks ago was ovulating from tues to the sat. we had sex the tues and sat and since sun 27th aug been feeling awful. period like stomach cramps, twinges in pelvis, nausea sometimes vomitting, headache, dizziness, am crying for no reason and snapping at everyone and pain in lower back.
every day i keep thinking am getting my period as cramps feel like it but not yet. am due them tomor but normally when i get the cramps i come on.o forgot to mention my boobs are killing me so sore even when breathe.
i did preg test last week was negative. and no its got to be too early to be preg and also if i was why now the chances wud be so slim.
just wondering can any of u give me advise or anyone else experience this.also my stomach is rock hard.
thanks in advance

Snap!!!

this is exactly how i feel, my period was due today and did not come!!
i have been crying at everything, and i am not the sensitive type, i have had bad cramps like im coming on but havent, i am always hungry but when i eat i feel sick!!!
in mornings i feel dizzy and sick never act thrown up tho... could i be pregnant i dnt wna spend all that money on a pregnancy test if my periods are late?? isit too early to take a ptest?

It didnt happen

well i am coming on slightly at the moment. am totally shocked. spent the whole morning been sick and really dizzy but this afternoon i spotted blood and no am coming on. got no idea why been so ill.
o well guess i wasnt so lucky. to be honest its put me off trying again as been so stressed all time and not sleeping and so ill