I need some help and input!

My last period was June 7th. I have a 27-28 day cycle. Longest being 29 days and shortest being 25 days.
​On Thursday the 19th, I had cramps, which I assume were from ovulation. Late that night, technically the 20th I guess (2-3am), my husband and I had sex. Afterward, I bled quite a but, which never happened before, but I assumed it was from ovulation. this encounter, my husband pulled out. 
​Friday (20th) during the day, we had a quickie in the afternoon. Again, he pulled out.
​On Saturday late night (1130pm-1230am) we had sex again. This time, we got a little consumed and he ended up coming inside of me. This was the 21/22. 
​Afterward, I was going to get plan b, but assumed we were past ovulation enough to have a slim chance. Then, I did a few calculators, and realized maybe we weren't far enough.
​Since ovulation, I've had serious cramps. My cervix is still high/med and soft/med, and my cm is watery/sticky, but scant. 
​I also took an opk yesterday, which came back very positive. I'm very confused now. 
​What do you think my chances of pregnancy would be? Why a positive opk 6dpo?
​We already have 3 kids, which includes a set of twins. I'm kind of freaking out. 
 
 

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