Am i pregnant

Some advice please... we have been ttc since dec. My cylce is a regualr 29 day cycle. My period lasts for 3-4 days and its always heavy. I always get cramps and sore boobs the week before af. My last 'period' came two days early, was very very light and stopped after two days. I had no cramps or symptoms. Since then i have had what i think are pregnancy symptoms, feeling sick, bad gas, heartburn, blocked and stuffy noise, fatigue, needing to pee alot, bloated and generally feeling crap. 

I would be around 21 dpo, we have taken 3 tests and all bfn. 

Does anyone have any similar stories where they have gotten a bfp?