No PMS symptoms? Period due

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So my period is due today according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> but I've been having slight cramps on and off the past couple days. Not as strong as usual. I have no other symptoms. I'm freaking out that I might be pregnant like implantation bleeding. When my bf and I have sex we use a condom. Is this normal for having different symptoms?