Pregnancy? or not?

[Miah182]

So I have been insanely sick these past months, I got my first period of the year on the 1st of January, 2016. Strangely, I got February's cycle on the 26 or the 27 of January again (2 periods in one month) . My mother and i just assumed that it had to do with the sickness that through it off. I had unprotected sex (no condom) on January 30th while still on my period, my boyfriend and i just had the urge and didn't think and right after the sex, my period completely stopped.

So as of today February 23, it has been 3 and 1/2 weeks since. 3 days ago i woke around 2 am feeling completely sick. every side of my body ached and was very uncomfortable, felt like throwing up but wouldn't come up, i felt sick for at least 3 hours and finally slept around 5 am. i do have insane mood swings and at times my breast would hurt but i am thinking that it is all in my head.

i have read that sperm can live inside you for 3-5 days and that it can start with your early ovulation. i have been too busy with school and work that i don't have time to stop by the hospital and have a pregnancy test but i just want to know what the possibilities are that i get pregnant with the given situation.?