BFP to bfn:(

S
Spoke too soon.  Got my BFP Christmas Day, stronger the next day and gradually got less until today-where I still had a positive but not as strong. 
Got my period about an hour ago and just got a beta of 22 back. 
So sad. 
Sitting around the pool with my husbands family, interstate, and trying to pretend everything is normal...
Fertility clinic has given me the option to start another cycle but gosh this is exhausting!! I feel so horrible.