Hiya hun, hope you're feeling better. The positive test is probably from residual hormones in your system (unless you've been having unprotected sex), I'd test again in a few days to a week, when you get a bfn then your cycle should start getting back to normal. If you continue to get positives it may be a new pregnancy or something left over from the MC so get to the doctor for them to run some tests.
You may ovulate before you have a period though so use something if you didn't want to try right away, and if you do then go for it! Hope this helps and best of luck sweetie!!