Not Sure If i Should Check Agian

Im Delores i have 2 beautiful boys 2yo n 6m old i want a baby girl but ive been trying for about 1 month now i recently got off the depo in march my date for my 3rd shot was march 21st idk if its still birth control symptoms or not but i took 2 pregnancy test abt 4 weeks ago n 2 weeks ago both negative nd ive been nausous even puked a couple times but my headaches have been terrible but they are slowing up but idk what i should do i feel im gonna puke wen i drink water n that's how i was w my 6m old just been feeln a lil off

any Advice ?