confused..could i be pregnant or is it in my head?

Hi there! Im wondering whether i could be pregnant or not (i know, just take a test!) i took 3 tests with the last one being on the 19th and all came up negative. My ovulation was roughly around Feb. 3-6th(i took an opk but i ran out before i got a positive..only got a faint line..and the calender on here said i should ovulate around the 3rd but i know that wasn't right.) BD during my ovulation period from Jan 24-Feb 6 every other day. My last period was Jan 20.
On Feb 16th i had some brownish/pink spotting. On the 17th i had light bleeding and from the 18th through the 20th brownish/pink spotting again but only found once each day.

Since the bleeding started I have been getting more and more nauseous but no vomiting, extremely tired all the time but at night when i try to go to sleep i have trouble, hungry constantly but nothing looks good and about 15-30 minutes after i eat i get the feeling like i have an empty stomach again and my stomach will growl at me even though im not hungry, back aches, headaches, leg cramps, really gassy and have some mild cramping...boobs were sore last week but not anymore, thirsty constantly, salivating more...

is this all in my head or could i be pregnant?? me and my husband are ttc and he's gone until mid march and would love to have him come home to a bfp! could i have tested too early or am i just wanting this so much that im just tripping off of everything i notice?? please help!! thanks!!