I have been trying to conceive for the past three months. We tried last month took a pregnant test it came back negative been taking ovulation test everyday since my last period stopped every test came back negative even around the time I should be ovulating so I went ahead and had intercourse and two days after I had bleeding. Pinkish color no smell only see it when I whip. (Never had spotting or pinkish spotting before) It s going on three days now. What could be the cause if the bleeding?