Best thing is to git to the doctor.
I had small amounts of blood - spotting before and after my period continuosly for 5 /6 months as well as a sharp pain in my left side . I went to see the nurse at the doctors , he advised a blood test and the nurse just asked if i was stressed or changes in diet , weight gain or loss or any breakups from realtionships all of whih can affect your hormones and period etc.
At the end of it all it was nothing just normal your gp will explain that spotting is a normal part of womens menstural cycle all woman will spot at one point. Tbh i thibk it was stress that caused it. Its simmilar to you , best thing i can advise you is to go to your gp theyll be able to help and it will put your mind at ease , if your a lil embarassed about seeing the gp , which everyone is but shouldnt be lol just ask to see the nurse .
Hope this helps
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