What Does Watery Bleeding After Intercourse Mean?

hi i'm 29 years old and have been trying to fall pregnant for 6 months. I had a very short cycle last as it was only 23 days, i made love to my partner as soon as i had stopped bleeding as this is when or near to when i was going to ovulate as predicted by monthly cycle calander and ovu plan scope also showed i was ovulating. bit confused because i started to have a watery bleed ( first pinkish red then brownish) the day after intercourse that lasted 2 days and has now gone. Got any ideas on what it could mean etc...
Thanks Doc