Bleeding after sex on the depo/injection?

It's your body adjusting to the artificial hormone in Depo. Your bleeding can be irregular until you've had 2 or 3 shots. After that it tends to settle down to little or no bleeding at all. It's just hormonal breakthrough bleeding.

Have you researched Depo Provera? Just to make you aware of the risks, & that the Manufacturer advises it shouldn't be a long term method of contraception.

They state that if you've no other option, then you should take regular breaks (every couple of years), to reduce the risks. They state that if you're on it a long time, that you ask for an MRI scan, to check your bones.

I suggest taking a good calcium supplement that has magnesium & vitamin d in the correct ratios, so that your bones absorb the vitamin d.

After just having 1 shot, your fertility can take up to 18 months to return.

When you stop getting the shots, it can take a long time to get regular periods back, too.

It's worth putting the name of the drug into the search field of this website, to see the full info on risks of health conditions etc. Just so that you're fully informed.

Depo mimics pregnancy, & therefore you can experience symptoms that you might get with pregnancy, such as lower back ache, as your pelvis softens to allow for a growing baby. Just one of the many things associated with Depo Provera.