Started bleeding. Help

Okay so I'm 5 months on T and have had a mirena 2 months

Stopped having cycles after the first injection And thus far have been just fine

Suddenly I've got stomach pain and some spotting I have no clue why this has never happened before

My injections were every 6wks but are changing to every 12 I have yet to get my next shot since about 11 wks ago so I'm soon due for another but don't think I should be bleeding though

It's really distressing to me and idk what to do