Hello and thankyou for approaching DoctorSpring with your query.
You need not worry as you are NOT pregnant. I have listed the reasons below.
1) Your pregnancy tests have all come negative, which rules out pregnancy
2) You have said you have not had intercourse. It is essential that there is penetration and ejaculation for pregnancy to occur. The sperm that fertilizes the egg is present in the semen and the semen is produced on ejaculation.
3) The semen has to reach and enter your cervix which is inside, an the end of your vaginal canal, hence penetration is necessary for pregnancy to occur.
4) As you have mentioned that you have had your period after the 'make out session' in which case even with the slightest chance, if pregnancy did occur, during your period your uterus lining was shed, and hence the fetus cannot survive and would have been shed at that time.
But either way you need to go and get yourself examined to see the cause of your irregular period and get treated for it.

Irregular period is very common and Polycystic Ovarian Disease (PCOD) is the most common cause. PCOD is multiple small cysts in the ovary which cause hormonal imbalance.
As a result of this women have irregular periods, alternating with ammenorhea (no period) to heavy prolonged bleeding.
You tend to gain weight, have excessive hair growth, feel tired at times. Once diagnosed, you are put on oral contraceptive pills that help regulate the menstrual cycles.

You also need to get yourself examined for hypothyroidism (low levels of thyroid hormone). Hypothyroidism is also common in women and hypothyroidism also causes irregular periods.
17% women experience ammenorhea as a result of being hypothyroid. Other symptoms are weight gain, feeling dull and fatigued, feeling cold more than usual, constipation.

My advise to you would be get a 1)Thyroid Function Test done 2) Go to the Gynecologist and get yourself examined to rule out Polycystic Ovarian disease. They will perform an abdominal ultrasound on you which will help in the diagnosis.

I hope this has helped. Feel free to follow up with any further query.

Thankyou

Hello and thankyou for the follow up question.

The symptom of pain that you are having is non specific, as it can be due to any reason such
1)Polycystic ovarian disease (PCOD) , or
2) Endometriosis (which is endometrial glands outside the uterus in non specific sites)
3) Or it could be that your are going to have your period soon.

As I have mentioned earlier, you need to get yourself examined.
An abdominal ultrasound will help make a definite diagnosis of the cause of pain and the irregular periods you are having.

I hope this has helped. Take care.

Thankyou.

Hello, you will have to undergo both a pelvic ultrasound and an abdominal ultrasound to rule out any other cause of your abdominal pain.
I hope this has helped.
Thankyou