HELP ME IM SCARED

My period is 4 days late but I've only had protected sex and been on the pill. I'm having some bloating, feeling tired, a little hungry, cramping and some pre period discharge that's normal (usually it's brown).

I also had surgery over the new year. After I had heavy bleeding in the middle of my cycle and my previous period was short. I'm SO scared that I'm pregnant even when there's very little chance of it being possible. I don't know if my period is trying to re regulate or what. Would it be a good idea to take a test? It'll help me calm down but I'm so scared it'll be positive.