Depo messing with my cycle?

So I just got off depo and started ttc. I would have been due for the next shot on sep. 24th. But in got what I thought was my af on the 8th to the 18th. Today ally normal except a little longer.  Then nothing for 3 days so I assumed it was just my body getting back on track but after those three days af( or whatever it may be) struck again. Only this time it's a lot heavier and I'm passing large clots(sorry tmi) every time I use the restroom. My question is if anyone has any light to shed on this. If it's normal or if it's something that should warrant a visit to the drs. Because this is all new to me and this was my 3rd time in depo... Any advice or answers would be greatly appreciated.