Need help!! Finally rainbow baby????

Ashton • Mommy to two gorgeous rednose pits💗 ttc my rainbow baby 🌈💞

Okay so I've had a miscarriage and I've been on birth control but stopped it because I missed a day and had sex now we are scared that I might be pregnant and today I started feeling sick and having really bad abdominal pain now I'm having a brown discharge that only shows when I wipe and I'm so scared what could this be?? Am I pregnant?? Help