extreme bloating at 4 weeks?!

Hey guys...today AF is due. I'm 14 DPO and CD 32. I've felt nauseous all day with that horrid metallic taste amongst many other early symptoms. so far only had BFNs on about 4 diff types of hpts. literally done about 10 tests in the last week! #POASobsessed. I have endometriosis so can often bloat and look and feel about 7months pg. I've just had dinner and my bloating has all of a sudden become sooo bad uncomfortable. It's the first time I've bloated like this since I had my coil removed on 7th sep. can anyone relate? can pg cause this or do you think it's just an endo flare up announcing AF?