I need answers please

So I'm 4 days late. Today I was suffering from cramps, not extremely painful but I took some tablets to eeze it off. I rushed to the toilet to find a redish/brown liquid that has now gone/ stopped? I'm sure I'm not pregnant though? I haven't had sore breasts, headaches, back ache or anything like that. I feel quite normal?? I'm getting impatient and stressed out thinking myself I am pregnant. I was stressed out before I was even due. I'm really worried and I can't have a baby right now, I'm not ready. I want it to come): 

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