feel pregnant but negative tests?

i was on seasonique for about 9 months and i decided to stop taking them when i was done with the pills, so my period came when it was suppose to because i was done with the pills so i havent had abnormal bleeding because i think i stopped them at a good time

that was a month, month in a half ago

i took an ovulation test 2 1/2 weeks ago and it came out positive and ive had unprotected sex a couple of times before and after

i feel nauseated,dizzy when getting up, my mood is crazy all over the place only my nipples are a little sore and i have off and on cramps and my feet and hands are always cold but sweaty and this has never happened before, lower backaches,gassy, and i vomited a couple of times i felt this way before and after i took the ovulation test

my stomach has been feeling weird lately too mostly upper but lower as well i feel nauseous laying on my tummy , it makes me want to throw up

and last night i had bad cramping i had to lay down, but still no period

i have had a runny nose and a weird scratchy feeling in my throat but it only lasted a day

i sort of think its in my head because i haven't had a period so im just waiting on it, what do you think?

is it just my birth control thats making me not have a period yet? is it still in my system even though i stopped?

my legs are sore/painful especially my inner thigh near my groin like i have been walking for miles but i haven't walked much today and i never felt this way before, it feels great when i try to stretch them

i took a pregnancy test and it came out negative, i was reading that some women take so many an all come out negative even though they know there pregnant

is it in my head what should i do?