BFP help?!

I took a FRER and I had a bfp. It wasn't faded or guessable, it was an obvious bfp. Shaking and excited I ran to the store just now and took 2 .99 cent test. Both point blank BFN. What is going on? I am about 10 DPO (Ovulation pain on the 5th). Period for the past two months have been on the 15th. Past 4 days I have been having unusually realistic/vivid nightmares, EWCM, and cramps last night. I woke up at 4am to throw up and did everything not too. Also today *tmi* diarrhea. My cervix was so low last night, and hard. Today it is high up. Has anyone had this happen and resulted into a for sure pregnancy?

I would buy some new tests and retry, just to cover your bases (digital maybe?). Sounds like something's going on there, especially if the first one was an plainly obvious BFP... FX x

Def get another frer or cbd I was getting positives on frer and cbd but pound shop ones are v v v v faint almost bot there so Def cud b the test Gl x

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Thanks ladies for the help!

Here is the test I took today and saw.Attachment 12367