Talk to Gynecologist on Irregular Periods,pelvic Pain And Back Pain

firstly I'm 27 yrs old. i have PCOS.

just to give u lil history of my previous menstruation. i had periods on 17 Nov.

i had intercourse without protection (without him discharging inside me) on 29 of Nov.

i took Ecp next day morning on 30th November.

then i had my periods on 14 Dec on 28th day of my cycle.. periods were for 4 to 5 days. for 3 days flow was good with bit of clotting next 2 days it became lighter (color was bright red just like my normal period).

to be on the safer side i took 2 pregnancy tests

one on 17 Dec it came out negative and other one on 22 Dec it also came out negative. after that i started having lower back pain which is also my old pain.. but pelvic pain too so i had to take some antibiotic for few days..

now its 13 of January and i haven't seen my periods.. is there any chance i might be pregnant? though i got periods 2 weeks after IC

i don't have any pregnancy symptoms at all.. and already took 2 pregnancy tests which came out negative as mentioned a