Ok so I’m on birth control and this is my second month, I’m during my period week and I’m bleeding bright red blood, my cramps are pretty bad on and off, I had sex and I showed syptoms of being pregnant but all the symptoms are also symptoms of my birth control pill like nausea it’s highly rated as symptom. I took a pregnancy test and it came out negative but then I got home and I pulled out my tampon and the end was dark like grey brownish blood which got me worried???