What could this be

I’m 3 days late on my period so I’m 16pdo ( I’m scared to test ) and I haven’t really had any discharge other then creamy white watery discharge and when I wiped this was on the toilet paper.. sorry for the hair 🤦🏽‍♀️

I’ve also had slight cramping in my lower abdomen and my pelvis and my thighs and my boobs are sore and feel so heavy and my back hurts and I’m tired and I have been getting headaches wayyy more then normal