Positive opk cd 13 & 18 ?

[mummof1]

I started testing with OPKs cd 12, which was negative . Then cd 13 I got a positive , followed by negative on cd 14 and 15. Today, cd 18 I felt cramping and decided to take a test after work . It was a blaring strong positive right away ! So I'm confused ? When did I ovulate ?! We have had sex every day except cd 13 (hubby wasn't around ) and cd 17.
Here's the two positive OPKs

 

[KAH1990]

I would say cycle day 18 looks positive and your cycle day 13 is almost there. Get bedding just in case and good luck hope you catch that bean

 

[mummof1]

Thank you ! I made sure we DTD last night and we will tn too !
Should I still expect my period to be due on cd 28?