What Causes A Delayed Period, Cramping, Linea Nigra With Stomach Movement?

I had sex with a condom on June 1st and it did not break...one week later i started taking birth control (Ortho Tri Cyclen Lo). I m ending my third month on BC and I ve convinced myself that I m pregnant from June 1st even though I ve had my period for the two months after that...however I haven t gotten my period this month at all. I ve been having weird cramps and linea nigra showed up a few days ago but i haven t had any morning sickness nor have my nipples gotten darker. I feel like I m going crazy because I ve completely convinced myself that I m pregnant and that my stomach has been growing and that I look 14 weeks pregnant and that the cramps are the baby moving...could I be pregnant or am I panicking over nothing?