Thanks for the query.
It is very unlikely of a pregnancy if you have had an intercourse just after the periods or during them.Since you had the Mirena removal, the hormones must have got imbalanced and hence delay in the cycles.The other factor for delay may include stress, anemia and hormone dysfunctions for example thyroid.I suggest you see a gynecologist and get you examined. If needed the doctor may perform a blood test to rule out pregnancy. Accordingly you will be treated to regularize the cycles.
Hope this helped
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