Could I be pregnant? Please help

Ok so I usually have periods that last 4-5 days and are very heavy. I’m on birth control but recently took two courses of antibiotics which say they may but very unlikely could mess with bc. I had two days of very very light bleeding that wouldn’t fill a tampon between them and I’ve been being sick and have constant headaches for the past few weeks. Also lots of white creamy discharge and painful cramps in stomach. Does anyone know if this could be pregnancy? I’m trying to get a test but I’m not allowed out on my own atm cause of mental health reasons and I can’t tell my mum about this unless I’m certain I could be. Any advice ladies??