Depo shot & periods...

Sarah

So.. My last shot ran out about 4 weeks ago. I didn’t go for another as I want to get my body back to normal and start to have periods again. Me and my OH are hoping to ‘try’ for a baby towards the end of the year so will be using condoms for the meantime. I had a personal training fitness session this week and I’m not sure if it’s a coincidence but I’ve ended up coming on my period slightly (the brown stuff) but heard exercise can start periods off? Is it not too soon to come on after the injection ran out?? Would this now mean I’m fertile again??