Over 10 BFP but scared I'm not actually pregnant :( :(

My husband and I wanted a baby for a while, yet now that I think I'm pregnant I'm stressed and worried it's not true!!!

I have been testing with cheap 50 for £2.00 tests I bought on ebay, and got BFN since 6dpo and still getting BFN at 12dpo.

At 10dpo after feeling pregnant I took a clearblue test and it was a veeeeery faint BFP, then took 2 x First Response and it was a faint BFP. I told myself it's an indent as it can't possible be that AMAZING, my dreams coming true. I tested with digital clearblue and got 'not pregnant'.

At 11dpo I got a faint BFP with clear blue but much darker than a day before, I got 2 faint BFP with tesco tests, and very faint bfp with some cheap ones from B&M. But still BFN with the cheap ebay ones. 

At 12dpo I got a faint BFP with clearblue, faint BFP with tesco, and '1-2 weeks pregnant' with clearblue digital.

But because the line isn't extremely dark and the cheap ebay ones are BFN, I'm worried I'm not really pregnant and that when I have my doctor's appointment it'll be a BFN and there..

However I been having symptoms, and my period isn't here yet (due between today and wednesday) and my cervix is high, I keep having stomach pinches/cramps etc, and I'm tired, and feel bit nauseous. 

Do you think I am pregnant?