You can still get bleeding through pregnancy.

What you may have had in May was the following.

Implantation Bleed on the 7th, then you tested got your + and then unfortunately m/c. But I can't be certain because I am no DR obviously.

But with now, it could be possible to be pregnant with temps sorry can't help you there as I haven't tempt in about 6months!! - have you done a test to see what happens?