Pregnant?

Had sex last month, not sure if it was implantation or my period. My periods are usually very heavy and that one was barely anything. It was only heavy for one day.

Right now my nipples feel so sore and irritated I don’t even want to wear a bra, headaches but I haven’t had any morning sickness. Also having clear/white discharge, but it’s usually just white before my period.

I am supposed to start my period in 4 days, should I test now or wait and see if my period starts? I am just freaking myself out lol so I wanted to test tomorrow.