So I usually get my period every 35-37 days (recently one month I had about a 38 day gap. Once)

It's now been about 44 days and counting that ive not had a period??? All the signs were there when I was due, I.e. Pains , aches , cramps. But as that phase flew by still no period.

I did a pregnancy test (didn't expect much coz I have been ttc for some time now), but that came out negative. What could this possibly mean?

I have been going through some stresses lately so maybe thats it? I've gone through bad things before but my period had never skipped like this. Help!