Late period after a chemical pregnancy

Last month I had minimal spotting from the 20th- 22nd ..my period was supposed to come on the 18th..I had a positive pregnancy test on the 22nd.. And a positive blood test that had very low hcg (25) on the 23rd...but then the spotting started again that night..levels were down to 5 by the 26th and I got my period. This month I was supposed to get my period on the 26th but I have nothing yet.. A little motion sickness this morning in the car..negative preg test for the past 3 days...I took today's in the afternoon. Can my period/ ovulation be off? Still any hope?