pill problems!

Jade
Hi girls!!
So I've been taking the mini pill constantly for around 3 months now. Before this I had a 3 month break as I was taking it for 2 years straight. If I ever missed it for more than 2/3 days I'd start to spot or bleed, sometimes for a good week I'd have bleeding like a normal period. Recently I've not been feeling right, nauseous, really bad mood swings, I've done pregnancy tests but all come back negative! I've missed my pill a lot recently and didn't want that to be the reason why my bodies not feeling right so decided to stop taking it (with doctors permission).  not been taking my pill for over a week now and still no sign of any blood or cramping nothing? Still feeling sick in evenings around the  same time, anyone had experiences like this? Could I be pregnant?