Possibly ovulaton?

So I am 10 weeks PP. Not breastfeeding and yet still no period have taken test this morning and even last night both negative. I am cramping badly, no spotting or blood. I do have breast tenderness every once and a while but not consistently (can be a pms symptom). Very confused. I have had cramps for about 2 weeks. All the pregnancy tests have came back negative just wondering what's up. I called my ob and they never got back ahold of me

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