pregnancy,periods, birth control please help!?

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

when will my periods return?

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, 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

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

should i take a test?

when will my period return?