I got my period the 28th it ended the 1st. I got food poisoning the 2nd and I'm still recovering although I am spotting.

I only see it when I wipe and it's either brown or light pink. I'm feeling extremely tired and I have been waking up nauseous with headaches and bloated a little bit. Can it just be the food poisoning or is it something I'm should look into more? Because I felt better yesterday and now horrible again today. Obviously getting a test is number one but what's the point of spending $20 to fail and it just be the food poisoning?? Has this ever happened to anyone