Hi girls I got a question regarding my period...

So my last proper period came on 24/4/17 and was a normal period for me being really heavy, clotty and lasting for 6 days. Me and my partner are ttc so basically have non protected sex each day, I don't really pay attention to ovulation predictions we just go with it and do it as much as we can. On the 9/5/17 I had really light pink discharge that lasted a few wipes then nothing then later in the evening more blood was visible but not a lot not clots very thin enough that a panty liner held it and I couldn't use a tampon, for me this is very out the ordinary and very early! It lasted 3 days this is what's making me confused? Anyone got a clue what it may be?