Confusing cycle! Concerned, please help!

I usually have my periods between the 27-29 of every month. Since the past two months, I have noticed mid-cycle spotting and thinking of it as ovulation spotting, my husband and I had intercourse since we are planning for a baby. I didn't get my periods in January, but after about a week today, noticed some blood. I've had some tendencies since the past few days (like morning sickness, lower back pain, cramps and increased vaginal discharge). I didn't do a pregnancy test at home all this while since I wanted to wait a few more days and observe. I'm confused- I'm on Duphaston since the past 6 months which seem to have properly regularised my periods, but what happened this month is very unusual and tricky. I'm feeling very nervous and concerned, please help!