Yep, you can. I have Paragard, and my doctor said tampons are fine with IUDs. I don't know how long the Mirena strings are, but I can hardly reach my Paragard strings. It would be next to impossible for me to grab one along with the tampon string. So plug away! You're safe.
DS: 11/8/11 | 9 lb 7 oz, 22 in DD: 5/22/14 | 9 lb 9 oz, 21.5 in
Yeah it's fine. I know somewhere in the information booklet it says something about being careful of the strings when removing it but I don't even know how that would be possible as the strings are wayy up there.
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Re: Dumb Mirena question (maybe TMI?)
LCT - 5.15.14 ~ 9lbs, 22.5 inches
DS: 11/8/11 | 9 lb 7 oz, 22 in
DD: 5/22/14 | 9 lb 9 oz, 21.5 in
DS born via unplanned C-section at 40w6d