Help ladies, confused! (One TMI pic)

sooo here it goes, I have irregular cycles so I'm not sure when af is due or when I ovulated. Hubby and I had sex a week ago unprotected. yesterday I cramped a little and had pink discharge. today I cramped a little more(still not like period cramps) but still just a tiny bit of pink discharge when I wipe and it's not there everytime. no other af symptoms at all. I took a test, but if this is implantation bleeding then it's still a good deal early. what do y'all think?! If it is implantation bleeding, when can I test again if af doesn't start!?