Is there any chance?

If af is due in 4 days and I've done 2 hpt's (1 was an early response test) and both are BFN, is there still a chance I'm pregnant? Not sure if I'm convincing myself of symptoms or not but could swear I feel different. Have had 2 mc's and I got a BFP straight away with them. Feeling very sorry for myself today :( x