+opk, cd 20, af due 6 days

Hey ladies. Help me out here. I miscarried last April and have resumed a normal cycle since September, with 27 day cycles and ovulation around cd13. It was the same this month, and I believe I ovulated on the 8 or 9, since I had my positive opk on the 7-8. I had extra opks laying around so I took one today, because I have some suspicions maybe we got lucky this month, but I didn't want to waste $ on hpt yet...It's still positive?!  Any thoughts!? Don't want to get my hopes up yet.  I know opks can't substitute as hpts and that it's still early. Just wondering if anyone else had similar experiences.