My boyfriend n i have been talking about having a baby, it would be my first child and his second.. (there is a ring coming in a few short months

.....
I am on implonon and I read that 1/100 women get pregnant on it, knowing my luck it would probably be me.. I have irregular periods due to this stupid BC.. lately they have gotten more normal. On January 16th I started my period and it ended finally ended on the 25th.. I had to follow up with the OBGYN due to a perinial and libia tear.. (my boyfriend and I have not had sex for 3 weeks. Due to my injury) .. we had sex the 28th and when he went there was a lot and it was like my body absorbed it. None came out..
On the 7th of February I started having cramps and I went to the bathroom and when I wiped I noticed light pink discharge ..I thought **** its just my period and then the 8th I have more cramps and dark brown discharge that doesn't smell normal..
I've been experiencing nausea, fatigue, back pain, been craving panda express like crazy(I hate chinese food) the slightest smells make me wanna throw up like car air Freshener other food etc.. my boyfriend has noticed me getting really moody and my nipples are more sensitive...
My boyfriend said he is noticing that he has become more like he needs (his head up my ***) and he said as soon as his ex got pregnant with his son he was the same way. Something clicked in him..
My period and ovulation tracker say my next period is due the 13 of Feb..
Any advice? Please. I'm 19 turning 20. I'm scared so many people are gonna judge me if I am