Positive OPK... x4 🤨

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So I’ve been TTC for 5 months now after a second trimester miscarriage. Never had a definite positive opk test until this week. Now I’ve had really dark positive opk tests the last 4 days?! I’ve not had a period since the miscarriage so no idea if/when I’m ovulating... what’s going on?! Can you ladies please help 😩