Unsure ..

So my boyfriend and I always have sex without a condom. He has came inside me bout 2 times, we were drunk and too into the  moment. Anyhow.. I feel every symptom in the book but never come out pregnant .. I have had 2 miscarriages before him. Like is this normal ? Does anyone else ever experience this ? I recently went to the doctor and they said no I wasn't pregnant . So it's just odd to me.. I also had mirena before I lost my second child has anyone else experience miscarriages after taking that birth control out ? I'd love to hear feed back ladies. Thanks ahead of time 😙💘