Has anyone conceived while having mirena in place?

Jen
I  had mirena placed 7 weeks pp. My baby is 23 weeks old now. I bled for an entire month after having mirena placed and after that I stopped having periods.if we are blessed with another baby I  would rather not  pregnant again until my little one is around two so I  opted for mirena. I'm bf also so that was the most reasonable choice.
Anyway, for a few days I have been feeling so ill, tired, crampy, headache, acne, eating everything in sight and bloating. Pretty much the same symptoms as when I was pregnant with my baby. I also check my IUD monthly and it's always in the correct place.
Today I wiped and had a streak of pink blood  then nothing. Should I consider that my period and not worry? 
I'd love to hear others experiences on this. I don't want to take a test just yet because it is so rare to fall pregnant on mirena but my brain will not shut off thinking of it!! It's so scary to not have a period!