Bleeding after sex

Taylor
My husband and I have been ttc for nearly 3 years now and I am on cycle day 63. So I have just missed my second period. I had some very light spotting a couple random days, not consecutive days. I have taken 2 test and both negative. The last one I took was about a week ago. Anyhow I noticed some light pink blood when wiping about 4 hours after sex. Has anyone had that before and what did it mean for you, if anything?