Missed period for two months.

I'm currently on cycle day 61, I haven't had my period in two months. I was feeling nausea so I took a pregnancy test on cycle day 52 and it was negative. Should I test again? My cycles are irregular but before this I would get them every month up to like 35 days. Yes, I'm sexually active and no we don't use condoms and he doesn't pull out. I don't know if I'm not ovulating or what. I haven't been stressed out or anything either. I think i had a long cycle like this maybe two years ago, and two months was the longest and I ended up not pregnant.