Too anxious. Regularly during pregnancy?

On 20th September first time we did fingering, I don't know surely that sperm have or not.. and I have irregular period LMP was on 15th August.. from 1st October I started to take deviry 10 as I wasn't sure about pregnancy then I checked home urine pregnancy test on 16th October it shows negative and on 21st October I started to bleed and from that day I started to take dronis 20 every month, and end of each pack I started to bleed... And also on December30, I did whole abdomen usg, it shows both ovary and uterus are normal in size. But now from February my lower abdomen started to tingling and shaking.. I feel too much nervous for that is it for pregnancy , am I pregnant? ????And during pregnancy, for unknowingly taking ocp cause bleeding every month??? Because in Google, I saw someone bleed upto 6 -7 months regularly during pregnancy???