Hello well me and my boyfriend been having sex without a comdom for months now and we been thinking I'M pregnant and I took a Walgreens test it said negative but I took it to late or early however then I think my period or something came on December 16th and I been experiencing nasauness and headaches and my back been hurting and I feel to throw up but don't and movement in my stomach Which I think it's gas but it stopped and I got bigger alittle and my line below my stomach look kinda longer and alittle dark and the rim around my nipple look darker but I'M really confused Why do I feel like this?