It sounds like you're concerned about it. You'd like another baby soonish, and this is a little earlier than you were planning, but not necessarily by a whole lot. While Plan B isn't contraindicated in medical literature during breastfeeding, it is a heavy dose of hormones, and I would still question how well all the effects of its use have been researched. I know that you have been trying FAM, and this would be a set-back to your efforts since it would put more synthetic hormones in your system. Is the risk that you would get pregnant and the need not to get pregnant right now high enough to certainly prolong your efforts to remove synthetic hormones from your system? I also know that you have previously stated that you didn't like the effect that being on hormonal birth control had on your system. It sounds like on your own, you'd lean towards accepting whatever happens, but your husband is leaning towards you taking Plan B. I know that you have to make a decision together, but if you are uncomfortable with all that is involved with overriding your body's natural cycle in hopes of ensuring that you get to wait a short while longer before getting pregnant, I'd say that's a pretty important factor to consider.
Â
For what it's worth, I looked at your chart. There is not enough information to be sure, but I would guess that the temperature jump today was not ovulation. Most women generally have at least 6 days of lower temps before the temperature rise, and your temp today is the same as it was 6 days ago. On top of that, your temp today is almost a full degree lower than your post-O temps from last cycle. You may be still adjusting to daylight savings time. IME, it takes a lot longer to adjust when you lose an hour than when you gain an hour, and your temp now is about what it was right before the time shift. Also, coming off of hormonal birth control you had a super long cycle with probably a short luteal phase last time. It is possible that it may still be a while before you ovulate or that your luteal phase would not be long enough for implantation to occur this time either. That's not to say I'd consider you "safe," just some interpretations I have.