Ovulation spotting

Has anyone ever experienced ovulation spotting? Hubby and I have been ttc for almost a year. I have irregular cycles and have been on Metformin for 4 months. Ny cycles vary from about 36 to 42 days. I started temping last cycle and I check my cm occasionally. Between cd 12 and 14 this cycle I was kind of sick to my stomach and had slight cramps. On cd 14 I noticed a spot of blood mixed in with ewcm in the afternoon. I checked bc I felt really wet and I wanted to know why. The blood went away shortly after. Like literally within a few minutes after seeing it. We DTD that night when he came home from work. Afterwards about cd 17 I had lots of creamy cm and it was really hard to even get 2 fingers in there to check bc it was so tight, like the walls were swollen or something. Today is cd 20 and it has been really wet down there since yesterday. When I checked my cm yesterday it was slippery and soft. We DTD this morning and I started spotting light pink afterwards. Do you guys think the blood I saw cd 14 was ovulation spotting? And why was it so tight av few days ago and but today? Anyone else experience spotting after sex?!