Help please

I had a period and then started a birth control, put the evra patch on a few days after it ended, however the patch was only on for around 48 hours before i took it off due to being sick. 4 or 5 days after taking it off i started what i think is a breakthrough bleed, does this restart my cycle? I was suppose to be ovulating at the time i started bleeding, but am i still fertile? I’ve been having sex since my period ended, but i’m not sure if the bleeding makes me infertile because it’s not a period related bleed.