Help please!!!!!😭

So I been on birth control since September and recently I been feeling very very off... I recently started having unprotected sex since my last period in January but I'm still on birth control... well with all the jokes from my friends about my sickness,

I went and took some pregnancy test. A couple weeks ago I took a few and they were all negative. I'm still feeling off so tonight I went and took another and this came up right away.

I'm not due for my period until Thursday but my periods have been late even with my birth control for the past couple months. Is this considered invalid because it seems the test line is darker than the control line. TIA!