I'm i pregnant? For 3 days this time!

I was kind of sexually active on 17th of march and had my periods then on 13th March to 16th March! It was for the first time and it was not kind of a sex sex!!  and also he did not came inside me nor outside me at all! But then i missed my periods in April! I did my urine test on 20th April which came negative! I did not waited for too long like after 2 mins i threw the kit! Then again I did test aft 7 days which again came negative! I felt a line but it was not a line! Again i did urine test next day which came negative to me! Also I waited 15 mins this time! Still there were no periods and i was freaking out! So i talked to a gynae and she suggested me to take deviry 10 mg! I took it for 5 days! Aft stoppage on the second day i went for a beta HCG test which came to be below 1.2 which meant negative to me! And next day i had my periods but it was kind of like rusty red colour with mucus also! I had cramps and the flow was too much on 1st day! Had my periods for 3 days this time!