Implantation bleeding?

Maria
Hi I been ttc for 3 year almost 
Last July I had a laparoscopic surgery I had 2 cyst in each ovary... My most fertile days was the 11th and 12th of this month.. Yesterday we bd it did not hurt at all but like 4 hours later 
I went to the bathroom and when I wipe it was light pink discharge but it was only once can this be implantation bleeding or something else please let me know what you guys think and thanks in advance 
And sorry for tmi