No period for two months negative tests, could she be pregnant?

Hi yall,

I am very excited and very worried at the same time, my girlfriend and I have frequent unprotected sex, I have never pulled out or anything. Now I know those actions can result in a baby, in which I would not be ashamed or mad about if she was pregnant. In face I would be happy. BUT, we're having a little dilema right now.

I bought her three Frist Response PHT's and she took one I believe four days ago and it came up negative but then she took one this morning and it also came up negative. Her period is two months late. She has many pregnancy symptoms:

1. Naisuia

2. Craving and increased appitite. I bought her Chinese food and she ate the whole thing then thirty minutes later wanted more food, I got it for her and she ate that too.

3. Extreme mood swings, she gets upset very easily and she gets angry easily. Her emotions dont make since to me at all and she has even said, "I dont know whats wrong with me."

4. Her boobs have gotten much bigger! I dont mind that too much.

5. Some weight gain in her mid-section, everyone at my job thinks shes pregnant. Today my boss pulled me into the office and asked me if she was expecting another grandchild (we're like a family at my job I have known everyone here since I was 9 years old). My boss also said that she looks pregnant and she was going to ask her but decided not too.

6. Back pains, I give her alot of massages because her back hurts so much and so do her feet so I rub them for her.

7. Fatigue, she is always tired she takes like three naps a day. Yesterday she fell asleep in the car twice.

8. Cravings, she always craves a BLT from Subway with a ton of mayo it looks so damn nasty, but shes eaten it like six days in a row. Last night it was ten o'clock and she called me pissed off wanting some tea or coffee???????

9. Her sexual wants are very off, one day she wants to tie me to the bed and have at it and another day she doesnt want to be touched.

10. She feels fat? She constantly feels as if shes gained weight, besides her breasts she hasnt gained much.

11. She hasnt had her period in TWO MONTHS, thats a major one! (I know I mentioned it before)

12. She says she feels pregnant but is unwilling to persue looking into it further because of the PHT results.

Another thing, I got curious and bought her a First Response Ovulation Test and instead of coming up with a negative or a positive it came up with a question mark. I thought it was weird so I decided to write it.