Positive OPK 4 days in a row

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Hey ladies,

I have done an OPK over a week ago and had a 2 negatives before getting my positive result. We did the BD.

Now a week later i got cramps again so I decided to re- test for ovulation and got 4 positive results in 4 different days in a row.

Is that normal.

I also have lower back pain that kept me up at night which is also unusual