Filament not sticking to bed (newbie)

[piecewise]

I'm very new to 3d printing and have a Flashforge Creator Pro and only have around 6 prints under my belt. It was going great until the filament stopped sticking to the bed out of nowhere. Every time the filament just comes right off the bed and messes up the whole print. After a little bit, however, the print starts working and the filament sticks but the filament that didn't stick already ruined it. I'm sure that theres a super good easy thing that I'm missing but I'm really confused as to why this is happening and if anyone has a fix it I would be very grateful. (I attached some images of what I'm trying to print and the result that comes out)