what's going on?

So I had a vvfl on Sunday- bit of a squinter but it was afternoon pee that I held for maybe 2 hours. On Monday afternoon I had another vvfl on pee that I held for 2 hours, perhaps. Then a fainter line in the evening on pee that I tried to hold for 4 hours but was closer to 3 1/2 because I was going to pop. DH and I decided to do one using FMU- I went to bed at 9 last night, woke at 2.30 desperate to pee so did the test. The line is really really faint. 
Symptom have been one episode of tingly boobs, queasiness for the last 3-4 days and no sign of AF- cervix is high and varying between hard and soft but tightly closed. Never had a positive on the internet cheapy test.  
My cycle is always 31 days and I'm now 4 days late. Does this sound like a chemical? I have a GP appoint on Thursday evening.